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# Regular polygon. Incircle and circumcircle

This online calculator determines parameters of circumcircle and incircle of a regular polygon

This online calculator determines parameters of circumcircle and incircle of a regular polygon.

$r_i=\frac{a}{2tan(\pi/n)}$

Polygon area
$S_p=\frac{1}{2}nar_i$

$r_c=\frac{a}{2sin(\pi/n)}$

Polygon area
$S_p=\frac{na^2}{4tan(\pi/n)}$

### Incircle of a regular polygon

Digits after the decimal point: 2

Incircle area

Polygon area

Area ratio

### Circumcircle of a regular polygon

Digits after the decimal point: 2