- Ball radius calculated by volume
- Circular segment
Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.

- Cone development
Calculator of right circular cone / truncated right circular cone development

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

- Pipe cold bending. Flexure depth with main shaft.
Calculates the section flexure depth with pipe bender or bending machine to obtain given parameters.

- 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 of regular polygon from polygon area
Calculates the side length of regular polygon given the area of the regular polygon and number of sides