geometry

In a right-angled triangle, the square of the longest side equals the sum of the squares of the other two: a² + b² = c².

A Möbius strip is a loop with only one side and one edge, made by giving a strip of paper a half-twist before joining its ends.

The hypotenuse is the longest side of a right triangle, opposite the right angle. In a right triangle, it is related to the other two sides by the Pythagorean theorem.