- Circle formulae
Circle formulae

- Circumcircle of a triangle
This online calculator determines the radius and area of the circumcircle of a triangle given the three sides

The approach to the calculation of the number of nested circles of smaller radius at a known length of the describing circle of a larger radius. Created by user request

- Incircle of a triangle
This online calculator determines the radius and area of the incircle of a triangle given the three sides

- Regular polygon, number of sides and length of side from incircle and circumcircle radii
This online calculator finds number of sides and length of side of regular polygon given the radii of incircle and circumcircle

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

- Side length of the regular polygon
Calculates the side length of the regular polygon circumscribed or inscribed to a circle. Created by user's request