1. alli14344

2. ryan123345

use the Pythagorean Theorem

3. ryan123345

$a^2 + b^2 = c^2$

4. ryan123345

Plug in the numbers $9^2 +12^2 = c^2$ $81 + 144 = c^2$ $225 = c^2$ $c =\sqrt{225}$ $c=15$

5. alli14344

thankyou so much!!!!

6. alli14344

can you help me with one more ????