Final answer:
The Pythagorean Theorem states that the square of the hypotenuse is equal to the sum of the squares of the other two sides in a right-angled triangle.
Step-by-step explanation:
The Pythagorean Theorem states that in any right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
This relationship can be expressed as a² + b² = c², where 'a' and 'b' are the lengths of the legs of the triangle, and 'c' is the length of the hypotenuse.