- Angular size, linear size and distance
These calculators computes value of angular size or linear size or distance from the other two's

- Area of a convex quadrilateral. Example of creating a calculator.
This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.

This online calculator computes the values of elementary trigonometric functions, such as sin, cos, tg, ctg, sec, cosec for an angle, which can be set in degrees, radians, or grads.

- Volume of the cylinder segment
Calculates volume of the cylinder segment