A right triangle has one leg of length 84 units. The hypotenuse is 91 units long. What is the length of the other leg?

Verified Answer :

From Pythagoras: a² + b² = c²,
∴ 84² + b² = 91²
∴ b² = 91² - 84²
∴ b = √(91² - 84²) = 35