The pythagorean theorem is used to prove that a triangle is a(n) triangle.

The Pythagorean theorem is used to prove that a triangle is a(n) triangle. 

The Pythagorean theorem is used to prove that a triangle is a right triangle. 

We also have Pythagorean triangle. This is known as primitive right triangle.

The used of the said theorem is to prove that the square on the hypotenuse of a right triangle is equal to the sum of the squares on the two legs. One of the studies said that the theorem is talking about the area of the squares that are built on each side of the right triangle.