A geometry problem by พันดารา ธุวจิตต์

Geometry Level 2

A circle is inscribed in a regular pentagon with center O O . If O A = 1 OA = 1 , what is the length of the diameter of this inscribed circle?

ϕ = 1 + 5 2 \phi = \frac{1+\sqrt5}2 5 \sqrt5 π 2 \frac\pi2 3 \sqrt3

พันดารา ธุวจิตต์ by พันดารา ธุวจิตต์ , 56, Thailand

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