In the diagram shown, the distance between points A and C is the same as the distance between points B and G.
2 answers:
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We can always split a regular polygon with sides into
triangles, whose base is the side of the polygon and whose height is the apothem of the polygon. So, the sum of the areas of all these triangles is
where is the number of sides,
is the side length, and
is the apothem length.
So, you just need to plug you values in: in your case, you have
So, the formula becomes