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Right angled triangle

The Pythagorean Theorem state that:

“The square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides.”

For a right angled triangle with the sides a,b and c, (where c is the hypotenuse), the formula of the Pythagorean Theorem is then given by:

a^2+b^2=c^2

If you want to calculate the length of a side, you just have to isolate a,b or c in the formula:

c=sqrt{a^2+b^2}

a=sqrt{c^2-b^2}

b=sqrt{c^2-a^2}

The formula a^2+b^2=c^2 only applies to right angled triangles. So it can also be used the other way round, to check if a triangle is right angled.

Pythagoras calculator

Right triangle with ABC

a: 
b: 
c: