Answer :
We would apply the tiangle inequality theorem which states that for the given lengths to form a triangle, the length of any two sides must be greater than teh length of the third side. By applying this theorem,
33 + 56 must be greater than 64
89 > 64
33 + 64 must be greater than 56
97 > 64
56 + 64 must be greater than 33
120 > 33
We can see that the theorem is obeyed. Thus, the side lengths form a right triangle.