9000045707 | math4u.vsb.cz

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9000045707

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Given a regular pentagon with the side

a

, find the radius

ρ

of the circle inscribed to this pentagon.

ρ = \frac{a}{2} \cdot tg 54^{\circ}

ρ = \frac{2 a}{tg 54^{\circ}}

ρ = \frac{a}{2 \cdot tg 54^{\circ}}

ρ = 2 a \cdot tg 54^{\circ}