Question

What is the value of x in the right triangle

Answer 1

This is a right triangle, so you can use the Pythagorean theorem.

a^2 + b^2 = c^2

x^2 + 3^2 = 9^2

x^2 + 9 = 81

x^2 = 72

x = sqrt(72)

x = 6sqrt(2)