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- Altitude of a triangle
This online calculator computes the length of a altitude of a triangle, given the lengths of edges of a triangle.

- Altitude Pressure
This calculator uses barometric formula to find out the pressure at the given altitude

- Angle bisector of a triangle
This online calculator computes length of angle bisector given the lengths of triangle edges

- 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.

- Arithmetic progression
This online calculator computes last nth term of arithmetic progression and sum of the members

- Barometric leveling
- Binary numbers calculator
This calculator supports common mathematical operations over binary numbers

- Boiling point dependence on the altitude above sea level
- Calculation of the volume by weight
Calculation of the volume and parameters of regular geometric figure by given mass using density of matter reference book.

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Cartesian and polar two-dimensional coordinate systems
This online calculator converts polar coordinates to cartesian coordinates and vice versa.

- Counting pipes from the end face
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

- Cylindrical tank volume
Cylindrical tank volume

- Density of oil
Recalculation of density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements. Density of oil. The tables for recalculation" standard

- Derivative calculator
Online calculator which determines first derivative of a function

- Determining air humidity with psychrometric method
- Direct observation error analisys
Calculates error of direct measurements for given measured value series and confidence interval.

- Geometric progression
This calculator computes n-th term and sum of geometric progression

- Hip roof calculator
This calculator will help you estimate hip roof parameters, including rafters and roof area

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