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Peter Chang
Posts:
8
From:
new zealand
Registered:
7/5/08


Re: trapeziod
Posted:
Jul 8, 2008 4:12 AM


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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