Question

Ariel completed the work below to show that a triangle with side lengths of 9, 15, and 12 does not form a right triangle.
9 squared + 15 squared = 12 squared. 81 + 225 = 144. 306 not-equals 144.
Is Ariel’s answer correct?
No, Ariel should have added 122 and 152 and compared that to 92.
No, Ariel should have subtracted 122 from 92 and compared that to152.
No, Ariel should have added 92 and 122 and compared that to 152.
Yes, Ariel’s work is correct.