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Math Forum » Discussions » Math Topics » geometry.pre-college.independent

Topic: trapeziod
Replies: 2   Last Post: Jul 8, 2008 4:12 AM

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Peter Chang

Posts: 8
From: new zealand
Registered: 7/5/08
Re: trapeziod
Posted: Jul 8, 2008 4:12 AM
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Suppose the included angle between the base and its adjacent side is a, the length of the base is b.

The formula for its area A is

A = b^2sin(a)[1 + cos(a)]/[1 + 2cos(a)]^2

If A is given, to find b, use the following formula

b = sqrt{A[1 + 2cos(a)]/[sin(a)(1 + cos(a))]}


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Date Subject Author
3/2/07
Read trapeziod
Tony Welscher
3/2/07
Read Re: trapeziod
G.E. Ivey
7/8/08
Read Re: trapeziod
Peter Chang

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