A triangle has sides of lengths 9, 7, and 12. Is it a right triangle? Explain.

Answer:
No, [tex] 9^2 +7^2 \neq 12^2 [/tex]
Step-by-step explanation:
[tex] 9^2 +7^2 = 81+ 49 =130...(1)[/tex]
[tex] 12^2 = 144...(2)[/tex]
From equations (1) & (2) it is obvious that:
[tex] 9^2 +7^2 \neq 12^2 [/tex]
Thus, the given is not a right triangle.