Oh yes, the Pythagorean Theorem has been proven.

The Pythagorean theorem uses the right triangle.

There are 19 various aspects of Pythagoras theorem.

Pythagorean Theorem (1)

Pythagoras Theorem(2)

Pythagorean Theorem (3)

Pythagorean Theorem (4)

Pythagoras Theorem(5)

Pythagorean Theorem(6)

Pythagrean Theorem(7)

Pythagoras Theorem(8)

Pythagorean Theorem (9)

Hyppocrates' lunar

Minimum Distance

Shortest Distance

Quadrangular Pyramid (1)

Quadrangular Pyramid (2)

Origami

Two Poles

Pythagoras Tree(1)

Pythagoras Tree(2)

Theorem by Pappus

You can use pythagorean theorem twice to find the diagonal of a cube