i need to find the area of a octagon with a perimeter of 40 ft and also find the same thing for a triangle and trapezoid. can you please help me fast?

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- Feb 14th 2006, 12:02 PMbritt12790[SOLVED] geometry shapes
i need to find the area of a octagon with a perimeter of 40 ft and also find the same thing for a triangle and trapezoid. can you please help me fast?

- Feb 14th 2006, 02:38 PMThePerfectHackerQuote:

Originally Posted by**britt12790**

Where is the number of sides and,

is the length of the sides.

But since it perimeter is 40 and there are 8 sides then each sides is 5. Thus,

But .

Thus,