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Area of the polygon with equal sides is .
Divide the polygon into congruent triangles with central angle .
The polygon is inscribed in circle with radius .
Therefore, two sides of the triangle have equal length of .
Determine area of the each triangle.
Area of each triangle is .
Here and .
Total polygon area is times the area of the single triangle.
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(b) Find .
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Assume .
As , then .
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Property of limit function: .
(a) .
(b) .
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