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find the perimeter and area of the polygon shown below. 15 ft 16 ft 8 f…

Question

find the perimeter and area of the polygon shown below. 15 ft 16 ft 8 ft 17 ft ( p = 72 ) feet, ( a = 300 ) square feet ( p = 87 ) feet, ( a = 360 ) square feet ( p = 72 ) feet, ( a = 308 ) square feet ( p = 56 ) feet, ( a = 308 ) square feet

Explanation:

Step1: Calculate the Perimeter

The polygon is a combination of a rectangle and a right triangle. The sides of the rectangle are 15 ft, 16 ft, 15 ft, and the top side of the rectangle plus the base of the triangle. Wait, actually, let's list all the outer sides: 15 ft (left), 16 ft (bottom), the slant side of the triangle (17 ft), the top horizontal segment (16 + 8? Wait no, looking at the diagram: the rectangle has length 16 ft, height 15 ft. Then there's a right triangle attached to the right side of the rectangle. The base of the triangle is 8 ft, height is 15 ft (since it's a right triangle with height equal to the rectangle's height), and hypotenuse 17 ft (which checks out: \(8^2 + 15^2 = 64 + 225 = 289 = 17^2\)).

So the perimeter is the sum of all outer sides: left side (15 ft), bottom (16 ft), the vertical side? Wait no, the rectangle has two vertical sides (15 ft each) and two horizontal sides? Wait no, the diagram shows a rectangle with length 16 ft, height 15 ft, and a right triangle attached to the right end. So the top horizontal side of the rectangle is 16 ft, then the triangle's base is 8 ft, so the total top horizontal length is 16 + 8? No, wait, the perimeter: let's identify each side.

  • Left vertical: 15 ft
  • Bottom horizontal: 16 ft
  • The vertical side at the right of the rectangle: 15 ft (but wait, the triangle is attached, so actually, the sides are: left (15), bottom (16), the slant side of the triangle (17), the top horizontal segment (16 + 8? No, wait, the top of the rectangle is 16 ft, then the triangle's base is 8 ft, but the top side of the polygon is 16 + 8? No, no, the perimeter is the outer edges. Wait, let's list all the outer sides:
  1. Left side: 15 ft
  2. Bottom: 16 ft
  3. The vertical side? No, the rectangle has a right angle, so after the bottom (16 ft), we go up the vertical side of the rectangle? Wait no, the diagram shows: left side (15 ft, vertical), top side (let's see, the rectangle's top is 16 ft, then the triangle's top is 8 ft? No, maybe I misread. Wait, the diagram: there's a rectangle with length 16 ft, height 15 ft, and a right triangle attached to the right end (so the rectangle's right side is vertical, and the triangle is attached to the top and bottom of the rectangle's right side). So the sides of the polygon are:
  • Left: 15 ft (vertical)
  • Top: 16 + 8? No, wait, the top of the rectangle is 16 ft, then the triangle's base is 8 ft (horizontal), so the top side of the polygon is 16 + 8? No, no, the perimeter is the sum of all the outer edges. Let's count:
  • Left vertical: 15 ft
  • Top horizontal: 16 + 8 = 24 ft? Wait no, that can't be. Wait, the triangle is a right triangle with base 8 ft, height 15 ft, hypotenuse 17 ft. So the polygon's sides are:
  1. Left: 15 ft (vertical)
  2. Top: 16 ft (horizontal, from left to the start of the triangle)
  3. Then the triangle's hypotenuse: 17 ft (slant side)
  4. Then the triangle's base: 8 ft (horizontal, but wait, no, the bottom of the rectangle is 16 ft, then the triangle's vertical side? Wait, no, the rectangle has height 15 ft, so the vertical sides are 15 ft. The bottom is 16 ft, the top is 16 ft (rectangle) plus 8 ft (triangle's base)? No, I think I made a mistake. Let's look at the answer options. The perimeter options include 72, 87, 56. Let's calculate the perimeter correctly.

The polygon is composed of a rectangle (16 ft by 15 ft) and a right triangle (base 8 ft, height 15 ft, hypotenuse 17 ft). So the outer sides are:

  • Left: 15 ft
  • Top: 16 ft (rectangle's top)
  • Hypotenuse of triangle: 17 ft
  • Bottom of triangle: 8 ft (horizontal)

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Answer:

Step1: Calculate the Perimeter

The polygon is a combination of a rectangle and a right triangle. The sides of the rectangle are 15 ft, 16 ft, 15 ft, and the top side of the rectangle plus the base of the triangle. Wait, actually, let's list all the outer sides: 15 ft (left), 16 ft (bottom), the slant side of the triangle (17 ft), the top horizontal segment (16 + 8? Wait no, looking at the diagram: the rectangle has length 16 ft, height 15 ft. Then there's a right triangle attached to the right side of the rectangle. The base of the triangle is 8 ft, height is 15 ft (since it's a right triangle with height equal to the rectangle's height), and hypotenuse 17 ft (which checks out: \(8^2 + 15^2 = 64 + 225 = 289 = 17^2\)).

So the perimeter is the sum of all outer sides: left side (15 ft), bottom (16 ft), the vertical side? Wait no, the rectangle has two vertical sides (15 ft each) and two horizontal sides? Wait no, the diagram shows a rectangle with length 16 ft, height 15 ft, and a right triangle attached to the right end. So the top horizontal side of the rectangle is 16 ft, then the triangle's base is 8 ft, so the total top horizontal length is 16 + 8? No, wait, the perimeter: let's identify each side.

  • Left vertical: 15 ft
  • Bottom horizontal: 16 ft
  • The vertical side at the right of the rectangle: 15 ft (but wait, the triangle is attached, so actually, the sides are: left (15), bottom (16), the slant side of the triangle (17), the top horizontal segment (16 + 8? No, wait, the top of the rectangle is 16 ft, then the triangle's base is 8 ft, but the top side of the polygon is 16 + 8? No, no, the perimeter is the outer edges. Wait, let's list all the outer sides:
  1. Left side: 15 ft
  2. Bottom: 16 ft
  3. The vertical side? No, the rectangle has a right angle, so after the bottom (16 ft), we go up the vertical side of the rectangle? Wait no, the diagram shows: left side (15 ft, vertical), top side (let's see, the rectangle's top is 16 ft, then the triangle's top is 8 ft? No, maybe I misread. Wait, the diagram: there's a rectangle with length 16 ft, height 15 ft, and a right triangle attached to the right end (so the rectangle's right side is vertical, and the triangle is attached to the top and bottom of the rectangle's right side). So the sides of the polygon are:
  • Left: 15 ft (vertical)
  • Top: 16 + 8? No, wait, the top of the rectangle is 16 ft, then the triangle's base is 8 ft (horizontal), so the top side of the polygon is 16 + 8? No, no, the perimeter is the sum of all the outer edges. Let's count:
  • Left vertical: 15 ft
  • Top horizontal: 16 + 8 = 24 ft? Wait no, that can't be. Wait, the triangle is a right triangle with base 8 ft, height 15 ft, hypotenuse 17 ft. So the polygon's sides are:
  1. Left: 15 ft (vertical)
  2. Top: 16 ft (horizontal, from left to the start of the triangle)
  3. Then the triangle's hypotenuse: 17 ft (slant side)
  4. Then the triangle's base: 8 ft (horizontal, but wait, no, the bottom of the rectangle is 16 ft, then the triangle's vertical side? Wait, no, the rectangle has height 15 ft, so the vertical sides are 15 ft. The bottom is 16 ft, the top is 16 ft (rectangle) plus 8 ft (triangle's base)? No, I think I made a mistake. Let's look at the answer options. The perimeter options include 72, 87, 56. Let's calculate the perimeter correctly.

The polygon is composed of a rectangle (16 ft by 15 ft) and a right triangle (base 8 ft, height 15 ft, hypotenuse 17 ft). So the outer sides are:

  • Left: 15 ft
  • Top: 16 ft (rectangle's top)
  • Hypotenuse of triangle: 17 ft
  • Bottom of triangle: 8 ft (horizontal)
  • Bottom of rectangle: 16 ft
  • Right vertical side? Wait no, the rectangle's right vertical side is internal? No, no, the diagram shows the rectangle with a right angle at the bottom left, bottom right, and top left. Then the top right has a right angle down to the bottom right, forming a rectangle, and then a triangle attached to the top right. Wait, maybe the polygon is a trapezoid? No, it's a rectangle with a triangle attached. Wait, let's list all the sides:
  • Left: 15 ft
  • Bottom: 16 ft
  • The vertical side at the right of the rectangle: 15 ft (but the triangle is attached, so maybe that's internal)
  • Then the triangle's hypotenuse: 17 ft
  • Then the triangle's base: 8 ft (horizontal)
  • Then the top side: 16 + 8 = 24 ft? No, that's not matching. Wait, the answer options have perimeter 72. Let's check: 15 + 16 + 15 + 17 + 8? Wait 15 (left) + 16 (bottom) + 15 (right vertical) + 17 (hypotenuse) + 8 (top horizontal)? No, that's 15+16=31, +15=46, +17=63, +8=71. Not 72. Wait, maybe the top horizontal is 16 + 8 = 24, then left 15, bottom 16, right hypotenuse 17, and the other vertical side 15. Wait 15 (left) + 24 (top) + 17 (hypotenuse) + 16 (bottom) = 15+24=39, +17=56, +16=72. Ah! There we go. So top horizontal: 16 + 8 = 24 ft, left: 15 ft, hypotenuse: 17 ft, bottom: 16 ft. Wait, no, that's four sides? No, a polygon has more sides. Wait, maybe the sides are: left (15), top (16 + 8 = 24), hypotenuse (17), bottom (16), and the right vertical side? No, that's five sides? Wait, no, the diagram shows a rectangle with length 16, height 15, and a triangle attached to the right end (so the rectangle's top is 16, then the triangle's base is 8, so the total top is 16 + 8 = 24. Then the left side is 15, bottom is 16, hypotenuse is 17, and the right vertical side is 15? Wait, no, the right vertical side is part of the rectangle, but the triangle is attached to the top and bottom of the rectangle's right side. So the perimeter is left (15) + top (24) + hypotenuse (17) + bottom (16) + right vertical (15)? No, that would be 15+24=39, +17=56, +16=72, +15=87. But that's not matching. Wait, the answer options have P=72. Let's recalculate:

Wait, maybe the polygon is a combination of a rectangle and a triangle, but the overlapping side is internal, so we don't count it. So the rectangle has sides 15, 16, 15, 16. The triangle has sides 8, 15, 17. But when we attach the triangle to the rectangle, we remove the 15 ft side (the right side of the rectangle), so the perimeter is (15 + 16 + 15 + 16) - 15 + (8 + 17) = (62) - 15 + 25 = 62 + 10 = 72. Yes! That makes sense. So the rectangle's perimeter is 2*(15+16)=62, but we remove the 15 ft side (since it's internal) and add the triangle's two sides (8 and 17). So 62 - 15 + 8 + 17 = 62 + 10 = 72. So perimeter P=72 feet.

Step2: Calculate the Area

The area is the area of the rectangle plus the area of the triangle.

Area of rectangle: \( A_{rect} = length \times width = 16 \times 15 = 240 \) square feet.

Area of triangle: \( A_{tri} = \frac{1}{2} \times base \times height = \frac{1}{2} \times 8 \times 15 = 60 \) square feet. Wait, but 240 + 60 = 300, but one of the options is P=72, A=308. Wait, maybe I made a mistake. Wait, the triangle's height: is the height 15 ft? Wait, the rectangle's height is 15 ft, so the triangle's height is 15 ft. But let's check the answer options. The options are:

  1. P=72, A=300
  2. P=87, A=360
  3. P=72, A=308
  4. P=56, A=308

Wait, maybe the polygon is not a rectangle and a triangle, but a trapezoid? Wait, no, the diagram shows a rectangle with a triangle attached. Wait, maybe the length of the rectangle is not 16? Wait, maybe the top side of the rectangle is 16 + 8? No, that can't be. Wait, let's re-examine the diagram. The bottom side is 16 ft, the left side is 15 ft, the top side has a segment of 8 ft, and the slant side is 17 ft. Wait, maybe the polygon is a combination where the top horizontal side is 16 + 8 = 24 ft, the bottom is 16 ft, the left is 15 ft, the right is 17 ft, and the other vertical side? No, this is confusing. Wait, let's use the perimeter we calculated as 72, so we can eliminate options with P≠72: options 2 (87) and 4 (56) are out. Now between options 1 (A=300) and 3 (A=308).

Wait, maybe the area is calculated as the area of a trapezoid? Wait, a trapezoid has two parallel sides. If the top base is 16 + 8 = 24 ft, bottom base is 16 ft, height is 15 ft. Then area of trapezoid is \( \frac{(a + b)}{2} \times h = \frac{(24 + 16)}{2} \times 15 = \frac{40}{2} \times 15 = 20 \times 15 = 300 \). But that's option 1. But option 3 has A=308. Wait, maybe the triangle is not a right triangle with base 8 and height 15? Wait, the hypotenuse is 17, so 8-15-17 is a right triangle (8²+15²=64+225=289=17²). So that's correct.

Wait, maybe the length of the rectangle is 16, but the top side is 16, and the triangle's base is 8, but the height is not 15? No, the vertical side is 15. Wait, maybe the polygon is a rectangle with a triangle attached, but the triangle's base is 8, and the rectangle's length is 16, but the area is rectangle (1615) plus triangle (815/2) = 240 + 60 = 300. So option 1: P=72, A=300. But wait, the third option is P=72, A=308. Maybe I made a mistake in the perimeter.

Wait, let's recalculate the perimeter again. Let's list all the sides:

  • Left: 15 ft
  • Top: 16 ft (from left to the start of the triangle)
  • Hypotenuse: 17 ft (slant side)
  • Bottom of triangle: 8 ft (horizontal)
  • Bottom: 16 ft (from the end of the triangle's bottom to the left)
  • Right vertical: 15 ft (from bottom to the start of the triangle's hypotenuse)

Wait, that's six sides: 15 + 16 + 17 + 8 + 16 + 15 = 15+16=31, +17=48, +8=56, +16=72, +15=87. No, that's 87. But that's option 2. But the first option has P=72. I'm confused. Wait, maybe the diagram is a rectangle with a triangle attached to the top, so the vertical side of the triangle is not 15. Wait, the problem says "the polygon shown below", but since we can't see the diagram, we have to go by the given lengths: 15 ft, 16 ft, 8 ft, 17 ft.

Wait, let's check the perimeter options. The first option: P=72. Let's see: 15 (left) + 16 (top) + 17 (hypotenuse) + 8 (bottom of triangle) + 16 (bottom) + 15 (right) = 15+16=31, +17=48, +8=56, +16=72, +15=87. No. Wait, maybe the right vertical side is not 15. Wait, the triangle's height is 15, so the vertical side is 15. Maybe the diagram is a rectangle with length 16, height 15, and a triangle attached to the right end, so the perimeter is 15 (left) + 16 (top) + 17 (hypotenuse) + 8 (bottom) + 16 (bottom) + 15 (right) – no, that's 87. But the first option has P=72. Maybe the triangle is attached to the top, so the vertical side is not 15. Wait, maybe the height of the triangle is not 15. Wait, 17² - 8² = 289 - 64 = 225 = 15², so the height is 15. So that's correct.

Wait, maybe the area is calculated as the area of the rectangle plus the area of the triangle, but the rectangle's length is 16, and the triangle's base is 8, but the total length is 16 + 8 = 24, and the height is 15, but maybe there's a mistake. Wait, the first option is P=72, A=300. Let's check the perimeter again. If the polygon is a trapezoid with bases 16 and 24 (16+8), height 15, then the perimeter would be 16 + 24 + 17 + 15 = 16+24=40, +17=57, +15=72. Yes! That works. So the trapezoid has two parallel sides: 16 (bottom) and 24 (top: 16+8), the non-parallel sides: 15 (left) and 17 (right). Then perimeter is 16 + 24 + 15 + 17 = 72. Perfect! So that's the perimeter. Now the area of a trapezoid is \( \frac{(a + b)}{2} \times h = \frac{(16 + 24)}{2} \times 15 = \frac{40}{2} \times 15 = 20 \times 15 = 300 \). So that's option 1: P=72, A=300. But wait, the third option is P=72, A=308. Maybe my assumption about the top base is wrong. Wait, maybe the top base is 16, and the triangle's base is 8, but the height is not 15. No, the vertical side is 15. I'm confused. Wait, let's check the answer options again. The first option is P=72, A=300. Let's go with that, as the perimeter calculation matches 72, and the area of the trapezoid with bases 16 and 24, height 15 is 300.

Wait, but maybe the diagram is different. Wait, the problem says "the polygon shown below" with 15 ft, 16 ft, 8 ft, 17 ft. Let's confirm the perimeter:

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