Pythagoras theorem is one of the famous theorems in mathematics. According to this theorem, When any angle is the right angle, the square of the longest side of the triangle is equal to the sum of the other two sides square. So Pythagoras Theorem formula is given below:

## Pythagoras Theorem Formula

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

So Lets Check:

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

9^{2} + 12^{2} = 15^{2}

81 + 144 = 225

225 = 225

So hence proved.