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Pythagorean Theorem
Using the Pythagorean Theorem to find a missing leg

We can use the Pythagorean theorem to find a missing leg of a triangle, but only if we know the length measure of the hypotenuse and the other one of the legs.

Find x 52=32+x2 x2=52-32 x2=25-9 x2=16 x=4

In a right triangle you know the hypotenuse is 25 units long and one leg is 20 units long.

Calculate the other leg:

 Solution: