Question

Use the Pythagorean theorem to find the missing side. C=9, a=3, find b.

Answer 1

Pythagorean Theorem is a$a^{2} + b^{2} = c^{2}$ . Plug in the given values: 3^2 + b^2 = 9^2
9+b^2 = 81
b^2 = 81-9
b^2 = 72
Square root both sides:
b = $\sqrt{72}$
Simplify $\sqrt{72}$ = $6 \sqrt{2}$

Answer 2

The square root of 90 is aprox. 9, thats your answer :)