SOLUTION: how do you find the area of a 20-ogon

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Question 571027: how do you find the area of a 20-ogon
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If you're given the side length, the apothem, or the radius, you use the formula for that.
If you're given the coordinates of the vertices, it's a different method.