Homework Help: math

Posted by anthony on Saturday, April 11, 2009 at 11:16pm.

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.

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?

math - Reiny, Saturday, April 11, 2009 at 11:26pm
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 this Question

Related Questions

algebra - A homeowner wishes to insulate her attic with fiberglass insulation to...
Algebra - A homeowner wishes to insulate her attic with fiberglass insulation ...
maths - A large canal will have a cross-section in the shape of an isosceles ...
math/geometry - An architect is designing a small A-frame cottage for a new ...
Algebra II - John can clean an attic in 11 hours. DeShawn can clean the same ...
geometry - ABCD is an isosceles trapezoid with a height of 4 inches and bases of...
calculus - The cross-section of a drain is a trapezoid. The sides and the bottom...
calculus - A water-trough is 10m long and has a cross-section which is the shape...
math - the main trunk of a tree is in the shape of a cylinder. The distance ...
algebra 2 - An auditorium has a curved back wall. A horizontal cross section of ...

For Further Reading

First Name:
School Subject:
Answer: