Trapezoid Problem: Calculate DC Length Given Area=80 and Height=8

Question

Given the trapeze in front of you:

Given h=8, AB=9.

Since the area of the trapezoid ABCD is equal to 80.

Find the length of the side DC.

00:00 Find DC

00:03 We will use the formula for calculating the area of a trapezoid

00:07 (Sum of bases(AB+DC) multiplied by height(H)) divided by 2

00:14 We'll substitute appropriate values and solve for DC

00:27 Divide 8 by 2

00:31 Isolate DC

00:45 And this is the solution to the question