Posted by **JdS** on Thursday, January 24, 2008 at 8:31pm.

what is the formula for the area of a regular polygon?

- geometry -
**Damon**, Thursday, January 24, 2008 at 9:18pm
A =(1/4) n a^2 ctn (180/n)

A is area

a is length of side

n is number of sides

ctn is cotangent

- geometry -
**Anonymous**, Tuesday, May 24, 2011 at 4:29am
if the angle of a regular polygon is 20 degrees how many sides does the ploygon have? 18 sides, but show your work

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