Question

a triangle has side lengths of 7,10, and 12. is the triangle a right traingle.

Answer 1

No, its not

Answer 2

To answer that question, you just need to ask yourself if the sum of the squares of the legs equal the square of the hypotenuse. In other words, does 7^2+10^2=12^2? We can easily see that 149 is not equal to 144, so the triangle is not right.