QUESTION IMAGE
Question
what is the volume of this figure?
4 m
6 m
4 m
6 m
4 m
6 m
12 m
cubic meters
Step1: Analyze the figure's structure
The figure can be divided into three rectangular prisms. Let's identify their dimensions.
- First prism (bottom left): length = 4 m, width = 4 m, height = 4 m.
- Second prism (middle top): length = 4 m, width = (12 - 4 - 6) = 2 m? Wait, no, wait. Wait, the total length is 12 m. The bottom part: let's re - examine. Wait, the bottom base: length 12 m, height 6 m, and then the middle part on top: length 4 m, height 6 m (since the total height from bottom to top of middle is 4 + 6 = 10? No, wait the bottom part has height 4 m, and the middle part on top has height 6 m. Wait, maybe a better way: divide the figure into three parts: left bottom, middle top, right bottom.
Wait, left bottom: length 4 m, width (let's assume the depth is 4 m? Wait, no, maybe the width is the same for all. Wait, maybe the figure has a uniform depth (let's say the depth is 4 m, since the left part has height 4 m and some length and width). Wait, perhaps the correct division is:
- Left rectangular prism: length = 4 m, width = 4 m, height = 4 m.
- Middle rectangular prism: length = 4 m, width = (12 - 4 - 6)=2 m? No, that can't be. Wait, the total length is 12 m. The right part has length 6 m, the left part has length 4 m, so the middle part (the top middle) has length 12 - 4 - 6 = 2 m? No, that seems wrong. Wait, maybe the figure is composed of three rectangular prisms:
- Bottom layer: a large rectangle with length 12 m, height 6 m, and width (let's say 4 m, since the left part has height 4 m and the depth seems to be 4 m). Then, on top of the middle part of the bottom layer, there is a rectangular prism with length 4 m, height 6 m, and width 4 m. Wait, no, the left part of the bottom layer: length 4 m, height 4 m, width 4 m. The middle part (the vertical part) : length 4 m, height 6 m, width 4 m. The right part of the bottom layer: length 6 m, height 4 m, width 4 m. Wait, let's calculate the volume of each part.
Volume of a rectangular prism is \( V=l\times w\times h \)
First part (left bottom): \( l = 4 \), \( w = 4 \), \( h = 4 \). So \( V_1=4\times4\times4=64 \) cubic meters.
Second part (middle vertical): The length here: the total length is 12 m. Left is 4 m, right is 6 m, so middle length is \( 12 - 4 - 6=2 \) m? No, that can't be. Wait, maybe the middle vertical part has length 4 m, height 6 m, and width 4 m. And the right bottom part: length 6 m, height 4 m, width 4 m. Wait, let's check the heights. The bottom layer has height 4 m, and the middle vertical layer has height 6 m (so total height from bottom to top of middle is 4 + 6 = 10? No, the left bottom has height 4 m, the middle vertical has height 6 m (so it stands on the bottom layer, so the total height of middle is 4+6 = 10? But the right bottom has height 4 m. Wait, maybe the figure has a depth (the third dimension) of 4 m (since the left part has a side of 4 m which we can take as depth).
So let's re - define:
- Left rectangular prism: length = 4 m, width = 4 m, height = 4 m. Volume \( V_1=4\times4\times4 = 64 \) \( m^3 \)
- Middle rectangular prism: length = 4 m, width = (12 - 4 - 6)=2 m? No, that's not right. Wait, the total length is 12 m. The right part has length 6 m, the left part has length 4 m, so the middle part (the vertical one) has length \( 12-(4 + 6)=2 \) m? No, that seems incorrect. Wait, maybe the middle vertical prism has length 4 m, width = 4 m, height = 6 m. And the right rectangular prism: length = 6 m, width = 4 m, height = 4 m.
Wait, let's calculate the total length of the bottom layer: 4 (left) + 4 (middle base) + 6 (right)…
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Step1: Analyze the figure's structure
The figure can be divided into three rectangular prisms. Let's identify their dimensions.
- First prism (bottom left): length = 4 m, width = 4 m, height = 4 m.
- Second prism (middle top): length = 4 m, width = (12 - 4 - 6) = 2 m? Wait, no, wait. Wait, the total length is 12 m. The bottom part: let's re - examine. Wait, the bottom base: length 12 m, height 6 m, and then the middle part on top: length 4 m, height 6 m (since the total height from bottom to top of middle is 4 + 6 = 10? No, wait the bottom part has height 4 m, and the middle part on top has height 6 m. Wait, maybe a better way: divide the figure into three parts: left bottom, middle top, right bottom.
Wait, left bottom: length 4 m, width (let's assume the depth is 4 m? Wait, no, maybe the width is the same for all. Wait, maybe the figure has a uniform depth (let's say the depth is 4 m, since the left part has height 4 m and some length and width). Wait, perhaps the correct division is:
- Left rectangular prism: length = 4 m, width = 4 m, height = 4 m.
- Middle rectangular prism: length = 4 m, width = (12 - 4 - 6)=2 m? No, that can't be. Wait, the total length is 12 m. The right part has length 6 m, the left part has length 4 m, so the middle part (the top middle) has length 12 - 4 - 6 = 2 m? No, that seems wrong. Wait, maybe the figure is composed of three rectangular prisms:
- Bottom layer: a large rectangle with length 12 m, height 6 m, and width (let's say 4 m, since the left part has height 4 m and the depth seems to be 4 m). Then, on top of the middle part of the bottom layer, there is a rectangular prism with length 4 m, height 6 m, and width 4 m. Wait, no, the left part of the bottom layer: length 4 m, height 4 m, width 4 m. The middle part (the vertical part) : length 4 m, height 6 m, width 4 m. The right part of the bottom layer: length 6 m, height 4 m, width 4 m. Wait, let's calculate the volume of each part.
Volume of a rectangular prism is \( V=l\times w\times h \)
First part (left bottom): \( l = 4 \), \( w = 4 \), \( h = 4 \). So \( V_1=4\times4\times4=64 \) cubic meters.
Second part (middle vertical): The length here: the total length is 12 m. Left is 4 m, right is 6 m, so middle length is \( 12 - 4 - 6=2 \) m? No, that can't be. Wait, maybe the middle vertical part has length 4 m, height 6 m, and width 4 m. And the right bottom part: length 6 m, height 4 m, width 4 m. Wait, let's check the heights. The bottom layer has height 4 m, and the middle vertical layer has height 6 m (so total height from bottom to top of middle is 4 + 6 = 10? No, the left bottom has height 4 m, the middle vertical has height 6 m (so it stands on the bottom layer, so the total height of middle is 4+6 = 10? But the right bottom has height 4 m. Wait, maybe the figure has a depth (the third dimension) of 4 m (since the left part has a side of 4 m which we can take as depth).
So let's re - define:
- Left rectangular prism: length = 4 m, width = 4 m, height = 4 m. Volume \( V_1=4\times4\times4 = 64 \) \( m^3 \)
- Middle rectangular prism: length = 4 m, width = (12 - 4 - 6)=2 m? No, that's not right. Wait, the total length is 12 m. The right part has length 6 m, the left part has length 4 m, so the middle part (the vertical one) has length \( 12-(4 + 6)=2 \) m? No, that seems incorrect. Wait, maybe the middle vertical prism has length 4 m, width = 4 m, height = 6 m. And the right rectangular prism: length = 6 m, width = 4 m, height = 4 m.
Wait, let's calculate the total length of the bottom layer: 4 (left) + 4 (middle base) + 6 (right) = 14? No, that's more than 12. Oh, I see my mistake. The total length is 12 m. So the left part (bottom left) has length 4 m, the right part (bottom right) has length 6 m, so the middle part (the base for the middle top prism) has length \( 12-(4 + 6)=2 \) m. But the middle top prism has length 4 m? That can't be. Wait, maybe the figure is composed of two parts: a bottom rectangular prism and a top rectangular prism.
Bottom rectangular prism: length = 12 m, height = 4 m, width = 4 m. Volume \( V_{bottom}=12\times4\times4 = 192 \) \( m^3 \)
Top rectangular prism: length = 4 m, height = 6 m, width = 4 m. Volume \( V_{top}=4\times6\times4 = 96 \) \( m^3 \)
Wait, but then what about the right bottom part? No, that's not correct. Wait, another approach: the figure can be seen as a large rectangular prism minus some parts, but it's easier to add.
Wait, let's look at the dimensions again. The left part: height 4 m, length 4 m, width 4 m. The middle part (the vertical part): height 6 m, length 4 m, width 4 m. The right part: height 4 m, length 6 m, width 4 m.
Now, check the total length: 4 + 4+ 6 = 14, which is more than 12. So that's wrong. Ah! The width (the depth) is 4 m for all. Let's consider the length along the x - axis (12 m), height along y - axis, and width (depth) along z - axis (4 m).
Bottom layer: height = 4 m, length = 12 m, width = 4 m. Volume \( V_1=12\times4\times4=192 \)
Top layer: height = 6 m, length = 4 m, width = 4 m. Volume \( V_2 = 4\times4\times6=96 \)
Now, check if there is any overlap. No, because the top layer is in the middle. Wait, but the right bottom part: no, the bottom layer is the entire base, and the top layer is in the middle. Wait, but the original figure has a notch on the left and right? No, the left has a protrusion? No, the figure is like a stepped shape. Wait, maybe the correct division is three rectangular prisms:
- Left: length = 4 m, width = 4 m, height = 4 m. Volume \( V_1=4\times4\times4 = 64 \)
- Middle: length = (12 - 4 - 6)=2 m? No, that's not. Wait, 12-4 - 6 = 2. So middle base length is 2 m, but the top middle prism has length 4 m. This is confusing. Wait, let's use the formula for the volume of a composite figure by adding the volumes of its components.
Looking at the figure, we can divide it into three rectangular prisms:
- Prism 1: Left - bottom. Dimensions: length = 4 m, width = 4 m, height = 4 m. Volume \( V_1=4\times4\times4 = 64 \)
- Prism 2: Middle - top. Dimensions: length = 4 m, width = (12 - 4 - 6)=2 m? No, that's 2 m. Wait, no, the width (depth) is 4 m. Wait, maybe the width is 4 m for all. So Prism 2: length = 4 m, width = 4 m, height = 6 m. Volume \( V_2=4\times4\times6 = 96 \)
- Prism 3: Right - bottom. Dimensions: length = 6 m, width = 4 m, height = 4 m. Volume \( V_3=6\times4\times4 = 96 \)
Now, sum the volumes: \( V = V_1+V_2+V_3=64 + 96+96=256 \)? No, that can't be. Wait, 64+96 = 160, 160 + 96=256. But let's check the total length: 4 (Prism 1 length)+4 (Prism 2 length)+6 (Prism 3 length)=14, which is more than 12. So my length calculation is wrong.
Ah! I see. The total length of the base is 12 m. So Prism 1 (left - bottom) has length 4 m, Prism 3 (right - bottom) has length 6 m, so Prism 2 (middle - top) has length \( 12-(4 + 6)=2 \) m. But Prism 2's length is 4 m? That's a contradiction. Wait, maybe the width (depth) is 4 m, and the height of the bottom part is 4 m, and the height of the top part is 6 m.
Let's calculate the volume as the sum of two parts:
- Bottom part: A rectangular prism with length = 12 m, height = 4 m, width = 4 m. Volume \( V_{bottom}=12\times4\times4 = 192 \)
- Top part: A rectangular prism with length = 4 m, height = 6 m, width = 4 m. Volume \( V_{top}=4\times6\times4 = 96 \)
Now, sum them: \( V = 192+96=288 \) \( m^3 \)
Wait, but let's check the length of the top part. The top part has length 4 m, and the bottom part has length 12 m. But the top part is in the middle? Wait, no, the left part of the bottom has length 4 m, the right part has length 6 m, so the middle part (where the top is) has length \( 12-(4 + 6)=2 \) m. But the top part has length 4 m, which is longer than 2 m. So that means the top part extends over the left and right parts? But the left part has a height of 4 m, and the top part has a height of 6 m, so the top part can't extend over the left part (since the left part's height is 4 m, and the top part's height is 6 m, so the top part is on top of the middle base which is 2 m long, but the top part is 4 m long, so it would overlap with the left and right parts. That can't be.
Wait, maybe the correct division is:
- The figure is composed of three rectangular prisms:
- Left prism: length = 4 m, width = 4 m, height = 4 m. Volume: \( 4\times4\times4 = 64 \)
- Middle prism: length = 4 m, width = 4 m, height = (4 + 6)=10 m? No, that's not. Wait, the height of the middle prism: from the bottom (height 0) to the top (height 4 + 6 = 10 m)? No, the left prism has height 4 m, the middle prism has height 6 m (on top of the bottom 4 m), so total height of middle is 10 m? No, the left prism's height is 4 m, the middle prism's height is 6 m, so the middle prism stands on the bottom layer, so the bottom layer has height 4 m, and the middle prism has height 6 m (so its base is on the bottom layer, and it goes up 6 m from the bottom layer's top).
Wait, let's use the correct method. Let's assume that the depth (the third dimension, let's call it width) is 4 m for all parts.
- Bottom layer: length = 12 m, height = 4 m, width = 4 m. Volume: \( 12\times4\times4=192 \)
- Top layer: length = 4 m, height = 6 m, width = 4 m. Volume: \( 4\times6\times4 = 96 \)
Now, check if the top layer fits on the bottom layer. The bottom layer has length 12 m, the top layer has length 4 m. So the top layer is centered? No, but the problem is about volume, so as long as we are adding the correct volumes, it's okay. Wait, but the right part of the bottom layer has length 6 m, and the left part has length 4 m, so the middle part of the bottom layer has length \( 12-(4 + 6)=2 \) m. But the top layer has length 4 m, which is longer than 2 m. This means that the top layer extends over the left and right parts. But the left part has height 4 m, and the top layer has height 6 m, so the top layer can't be on top of the left part (since the left part's height is 4 m, and the top layer's height is 6 m, so the top layer would be 6 m tall, while the left part is 4 m tall, so the top layer is on top of the bottom layer, overlapping with the left and right parts? No, that doesn't make sense.
Wait, maybe I made a mistake in the height. Let's look at the diagram again. The left part has height 4 m, the middle part (the vertical part) has height 6 m (so from the bottom to the top of the middle part is 4 + 6 = 10 m? No, the left part's height is 4 m, the middle part's height is 6 m (so it's 6 m tall, sitting on the bottom layer which is 4 m tall? No, the left part is 4 m tall, the middle part is 6 m tall (so its base is on the bottom layer, and it goes up 6 m, so the total height of the middle part is 4 + 6 = 10 m? No, the diagram shows the left part with height 4 m, the middle part with height 6 m (the 6 m is labeled next to the middle part), and the right part with height 4 m.
Wait, let's calculate the volume by dividing the figure into three rectangular prisms:
- Left - bottom: length = 4 m, width = 4 m, height = 4 m. Volume: \( 4\times4\times4 = 64 \)
- Middle - vertical: length = 4 m, width = 4 m, height = 6 m. Volume: \( 4\times4\times6 = 96 \)
- Right - bottom: length = 6 m, width = 4 m, height = 4 m. Volume: \( 6\times4\times4 = 96 \)
Now, sum these volumes: \( 64+96 + 96=256 \). But this can't be right because the total length of the bases (4 + 4+ 6) = 14 m, but the total length of the figure is 12 m. Ah! Here's the mistake. The width (the depth) is not 4 m for the middle vertical prism. Wait, the total length of the figure is 12 m. So the left part (length 4 m), the middle part (length x m), and the right part (length 6 m) must satisfy \( 4 + x+6 = 12 \), so \( x = 2 \) m. So the middle vertical prism has length 2 m, not 4 m.
So let's recalculate:
- Left - bottom: length = 4 m, width = 4 m, height = 4 m. Volume: \( 4\times4\times4 = 64 \)
- Middle - vertical: length = 2 m, width = 4 m, height = 6 m. Volume: \( 2\times4\times6 = 48 \)
- Right - bottom: length = 6 m, width = 4 m, height = 4 m. Volume: \( 6\times4\times4 = 96 \)
Now, sum the volumes: \( 64 + 48+96=208 \). No, that still doesn't seem right.
Wait, maybe the figure is a combination of a large rectangular prism and a smaller one. Let's consider the entire figure as a rectangular prism with length 12 m, height (4 + 6)=10 m, width 4 m, minus the two notches on the left and right.
The large rectangular prism: length = 12 m, height = 10 m, width = 4 m. Volume: \( 12\times10\times4 = 480 \)
Left notch: length =