Triangle Math - Trigonometry

Xavier B.

About this app

Triangle Math is an app that permit to solve any kind of triangle. Just enter at least 3 parameters (Triangle sides or angles) to get an automatic display of solved triangle and all calculated values!

But there is more: the mathematic methods of calculation used to solve the triangle are visible by clicking on output parameters. These calculation details contains even solved literal equation!

Triangle Math includes the following mathematic laws and theorems:
- Sines law
- Cosines law
- Sum of angles
- Heron’s formula
- Triangle surface formula

For right triangle specific case :
- Pythagorean theorem;
- Sine;
- Cosine;
- Tangent.


Triangle Math supports "degrees" and "radians" as angle units. It is possible to enter particular angles (π/2 ; π/3; π/4 ; π/6 ; ...) when choosen unit is radians.

With Triangle Math, discover or rediscover the trigonometric methods used to solve a triangle!

Triangle Math is not only a trigonometry helper, it can also be used in different fields : architecture, construction, ...

Triangle Math is a must-have mathematic app!

Ratings and reviews

The app is very useful and easy to use. (A minor bug: The the third addend in the Law of Cosines is reported with the + symbol, in place of the - simbol)

Very helpful app. Spares me from having to use the cosine rule, etc. Keep up the great work.

Very enjoyable, with helpful formulas behind the results.

What’s new

App is back online ! Triangle Math is rewritten to support latest Android versions.
Cosines law formula display error is finally fixed !
Right triangle and flat triangle calculation also fixed.