In the figures below, the side lengths of the squares are the same as the side lengths of their respective triangles. Note: figure not drawn to scale

In Figure 1, STU is a right triangle. The area of square G + area of square H is equal to the area of square I.

In Figure 2, XYZ is an acute triangle. The area of square D + area of square E is not equal to the area of square F.

What can be concluded about PQR in Figure 3?
A.
PQR is a right triangle.
B.
PQR is an acute triangle.
C.
PQR is an obtuse triangle.
D.
PQR is an isosceles triangle.