Pythagorean theorem: the sum of the squares of the two sides of a right triangle equals the square of the hypotenuse Q: is the sum of squares of two sides the sum of squares of the lengths of two sides?

Pythagorean theorem: the sum of the squares of the two sides of a right triangle equals the square of the hypotenuse Q: is the sum of squares of two sides the sum of squares of the lengths of two sides?

Yes, what else can we square apart from the length