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Trigonometry

Each side of a regular pentagon is 48 cm. find the length of the radius of a circle inscribed in a pentagon

$\frac{L}{2}cot(\frac{\pi}{n})$

or, if in degrees:

$\frac{L}{2}cot(\frac{180}{n})$

n is the number of sides and L is the length of a side.

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