Suppose a triangle has sides a, b, and c with side c the longest side, and that a2 + b2 > c2. Let θ be the measure of the angle opposite the side of length c. Which of the following must be true? Check all that apply ...

The correct answer to your choices are the following:

-The said triangle is not a right triangle, according to your data, if C is the longest side of the triangle so it may affect the angle of the remaining sides.

-The triangle is an acute triangle.

I hope that you are satisfied with my answer