Question

ABCD is a trapezoid with AD = 5 ft, DC = 7 ft, and AB = 15 ft.

Find the area of the trapezoid.

Answer 1

I'm assuming this is an isosceles trapezoid. There is a special formula for this is analogous to Heron's formula.
\[s = 0.5(b _{1}^{} + b _{2}^{} + 2h)\]\[A = \sqrt{(s - b _{1}^{})(s-b _{2}^{})(s-h)^{2}}\]

Answer 2

that is analogous*

Answer 3

You can use that to find your area.