Pythagorean Theorem Calculator
Enter the values to calculate the length of the third side of a rightangled triangle using this Pythagorean Theorem Calculator.
Pythagoras Theorem Calculator

Select side

Adjacent side (a) =

Opposite side (b) =

Hypotenuse side (c) =
Pythagorean Theorem Calculator
The calculator helps to find the length of the unknown side of the rightangled triangle by using the hypotenuse formula.
It solves the equation for side a, b, or c and calculates the final result with one click.
What is Pythagorean Theorem?
The theorem describes that how all three sides of a right triangle are connected in Euclidean geometry.
Pythagoras Theorem states that, “sum of the squares of the two sides of a right triangle is equals to the square of the hypotenuse.”
The hypotenuse is opposite to 90^{°} and it is considered as the longest side in a right triangle.
Pythagorean Theorem Formula
According to the above definition, the Pythagorean equation is:
Hypotenuse^{2} = Perpendicular^{2} + Base^{2}
Or
c^{2 }= a^{2} + b^{2}
Where,
c is hypotenuse,
a is adjacent side,
b refers to the opposite side of hypotenuse.
How to find an unknown Side of a Right Triangle?
The Pythagorean Theorem solver uses the above formula to find the length of the unknown side of right triangle.
To find the length of the hypotenuse ‘c’, it uses the below equation:
c =
To calculate the length of the side ‘a’, it uses the below equation:
a =
And to solve the length of the side ‘b’, it uses the following equation:
b =
Example:
Consider the smallest Pythagoras triple as: a=4, b=3. Calculate the unknown side of the rightangle triangle.
Step 1: Use the Pythagorean Theorem equation.
c^{2 }= a^{2} + b^{2}
Step 2: Enter the values into the equation.
c^{2}= 4^{2} + 3^{2}
Step 3: Complete the calculations.
c^{2} = 16 + 9
c^{2} = 25
Take square root on both sides.
c = 5