Question

perimeter by measuring lengths
practice
enter the perimeter.
cm

Explanation:

Step1: Measure the base length

The bottom ruler shows the base length. From the ruler, the base length is $9 - 1 = 8$ cm (assuming the start is at 1 cm and end at 9 cm, but actually, looking at the scale, the base is from 0 to 8? Wait, no, the bottom ruler: let's check the markings. Wait, the bottom ruler has 1,2,...13. The base of the shape: the bottom side, when measured with the bottom ruler, from 1 to 9? Wait, no, maybe the shape is a trapezoid? Wait, the top horizontal side: the top ruler (the small one) has markings from 1 to 9? Wait, the small ruler (top horizontal) has 1 at the right, 9 at the left? Wait, no, the small ruler is reversed? Wait, the small ruler (horizontal) has numbers 1,2,3,4,5,6,7,8,9? Wait, no, the small ruler (the horizontal one) has 1 on the right, 9 on the left? Wait, maybe the length of the top side: the small ruler, from 1 to 9? Wait, no, the length is the difference. Wait, the top horizontal side: the small ruler, let's see, the left end is at 9 (on the small ruler) and right end at 1? Wait, no, the small ruler is placed with 1 on the right, 9 on the left. So the length is $9 - 1 = 8$ cm? Wait, no, maybe the top side is 8 cm? Wait, the bottom side: the bottom ruler, from 1 to 9? Wait, the bottom ruler has 1,2,...13. The bottom side of the shape: from 1 to 9? So length is $9 - 1 = 8$ cm? Wait, the two non - parallel sides: the slant side is measured with the vertical (slanted) ruler. Let's see, the slant side: from, say, 4 to 10? Wait, the vertical ruler (slanted) has markings. Wait, maybe the shape is a trapezoid with two parallel sides (top and bottom) each 8 cm, and the two non - parallel sides: let's check. Wait, maybe I made a mistake. Wait, the problem is about a trapezoid? Wait, no, maybe it's a parallelogram? Wait, no, looking at the rulers:

Top horizontal side: measured by the small ruler. The small ruler has 1 at the right, 9 at the left. So length is $9 - 1 = 8$ cm.

Bottom horizontal side: measured by the bottom ruler. From 1 to 9, so length is $9 - 1 = 8$ cm.

Left slant side: measured by the slanted ruler. Let's see, the slanted ruler: from 4 to 10? Wait, no, the slanted ruler has markings. Wait, maybe the left side is from 4 to 10, so length is $10 - 4 = 6$ cm? Wait, no, maybe the two non - parallel sides are each 6 cm? Wait, no, maybe it's a rectangle? No, the slant ruler is at an angle. Wait, maybe the shape is a trapezoid with top base 8, bottom base 8, and the two legs each 6? No, that would be a parallelogram. Wait, maybe the correct measurement:

Wait, the top side: the small ruler, from 1 to 9 (since the ruler is reversed, the length is $9 - 1 = 8$ cm).

Bottom side: the bottom ruler, from 1 to 9, length $9 - 1 = 8$ cm.

Left side: the slanted ruler, from 4 to 10, length $10 - 4 = 6$ cm.

Right side: wait, no, maybe the shape is a trapezoid with two parallel sides (top and bottom) of 8 cm, and the two non - parallel sides (the left and right) each 6 cm? Wait, no, maybe I misread. Wait, the problem is to find the perimeter. Let's assume the shape is a parallelogram (since top and bottom are equal). Wait, no, maybe it's a rectangle? No, the slant ruler is at an angle. Wait, maybe the correct lengths:

Top: 8 cm (from small ruler: 9 - 1 = 8)

Bottom: 8 cm (from bottom ruler: 9 - 1 = 8)

Left: 6 cm (from slanted ruler: 10 - 4 = 6)

Right: 6 cm (since it's a parallelogram, opposite sides are equal)

Then perimeter $P=8 + 8+6 + 6=28$? Wait, no, that can't be. Wait, maybe the top side is 8, bottom side is 8, and the two legs are 6 each? Wait, no, maybe the slanted ruler is measuring a side of 6 cm, and the other side is also 6 cm. Wait, maybe I made a mistake in the ruler readings.

Wait, let's re - examine:

The small horizontal ruler: the numbers are 1,2,3,4,5,6,7,8,9 (from right to left). So the length of the top side is the distance between the two ends. If the left end is at 9 and right end at 1, the length is $9 - 1 = 8$ cm.

The bottom horizontal ruler: numbers are 1,2,3,4,5,6,7,8,9,10,11,12,13 (from left to right). The bottom side of the shape: from 1 to 9, so length is $9 - 1 = 8$ cm.

The slanted ruler: numbers are 4,5,6,7,8,9,10,11,12,13 (from bottom to top). The slant side of the shape: from 4 to 10, so length is $10 - 4 = 6$ cm.

Since the shape is a parallelogram (opposite sides equal), the other slant side is also 6 cm.

So perimeter $P = 8+8 + 6+6=28$ cm? Wait, no, that seems too big. Wait, maybe the top side is 8, bottom side is 8, and the two legs are 6 each. Wait, but maybe the ruler readings are different. Wait, maybe the top side is 8, bottom side is 8, and the two legs are 6 each. So perimeter is $8 + 8+6 + 6 = 28$? Wait, no, maybe I messed up the ruler directions.

Wait, another approach: maybe the shape is a trapezoid with bases 8 and 8 (so it's a parallelogram) and legs 6 and 6. So perimeter is $8 + 8+6 + 6=28$. But maybe the correct answer is 28? Wait, no, maybe the length of the slant side is 6, and the other side is also 6. Wait, maybe the top side is 8, bottom side is 8, left side 6, right side 6. So perimeter is 8 + 8+6 + 6 = 28.

Step2: Calculate the perimeter

Perimeter of a quadrilateral is the sum of all its sides. If we have two sides of length 8 cm and two sides of length 6 cm, then $P=8 + 8+6 + 6 = 28$ cm.

Answer:

28