Formula to draw a regular polygon inscribed or circumscribed to a circle

r: radius of the circle
(x, y): center of the circle
N: number of sides of the polygon
k: index of the vertex
rp: radius of the polygon
rp = r (for inscribed polygon)
rp = r/cos(pi/N) (for circumscribed polygon)
V(k) = (rp * cos(2 * pi * k / N) + x, rp * sin(2 * pi * k / N) + y), for all k in [0, N)

[@farbodshahinfar4246]

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[@insight8226]

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