The cross section of an attic is in the shape of an isosceles trapezoid. If the height of the attic is 9 feet, BC=12 feet, and AD=28 feet, find the length of line AB to the nearest foot.

Question

The triangle of the trapezoid is triangle ABE and the bases are BC and AD.

Could you also give me a link about the theorems and postulates of a two column proof?

Answer 1

I assume BE is the height of the trapezoid.
then AE=8
and by Pythagoras
AB^2 = 64+81 = 145
AB = √145 = 12.042

Answer 2

Eat some wee wee you ain't you when you're hungry.