In a right-angled triangle, the longest side is called the hypotenuse, and in this section, we will learn about the hypotenuse formula. The hypotenuse is always the side that is opposite to the right angle in a right triangle. We use Pythagoras theorem to find the hypotenuse, and thus the hypotenuse formula. By Pythagoras theorem, the square of the hypotenuse is equal to the sum of the squares of the other two sides (legs).
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