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- 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.

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

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