Question

There is a quadrilateral with a perimeter of 20 cm. Three sided length are 1/5 of the perimeter, 3/10 of the perimeter, and 3/15 of the perimeter. How long is the fourth side length? What is the name of this quadrilateral? Show steps.

Answers

GPT 3.5
Let the lengths of the three sides be x, y, and z, where:

x = 1/5(20) = 4 cm
y = 3/10(20) = 6 cm
z = 3/15(20) = 4 cm

Now, we know that the perimeter of a quadrilateral is equal to the sum of all four sides. Therefore, the sum of the three known sides x, y, and z is 4 + 6 + 4 = 14 cm.

Let the length of the fourth side be w cm. We know that the perimeter of the quadrilateral is 20 cm. Therefore, we can write the equation:

x + y + z + w = 20

Substitute the values of x, y, z, and the sum of the three known sides into the equation:

4 + 6 + 4 + w = 20
14 + w = 20
w = 20 - 14
w = 6

Therefore, the length of the fourth side is 6 cm.

This quadrilateral is called a trapezoid - a quadrilateral with at least one pair of parallel sides.

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