HELP PLEASE PYTHAGOREAN THEOREM

HELP PLEASE PYTHAGOREAN THEOREM class=

Answer :

Your answer is 13.8 or 14

A^2 + B^2 = C^2
7^2 + 12^2 =C^2
49 + 144 = 193
193=13.8 (Square root 193)
C^2 is 13.8 or 14