Final answer:
The Pythagorean Theorem relates the lengths of the sides of a right-angled triangle.
Step-by-step explanation:
The Pythagorean Theorem, named after the ancient Greek philosopher Pythagoras, relates the lengths of the sides of a right-angled triangle.
It states that the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.
Mathematically, the theorem can be expressed as: a² + b² = c², where 'a' and 'b' represent the lengths of the legs of the triangle, and 'c' represents the length of the hypotenuse.