Answer to Question #5329 in Calculus for Jessica
So we have to find
the area of S.
Notice that S is an isosceles trianlge with two sides of
The angle betwenn these sides is 2*pi/n.
It is known that the
area of a triangle with sides a, b, and angle phi between them is
In our case
S = 1/2
* r^2 * sin(2*pi/n)
A_n = n*S = 1/2 * n * r^2 *
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