Question

the diagram below is an oblique, or slanted, rectangular prism. not all angles shown are 90°. name two planes that are parallel.

Explanation:

In a rectangular prism, opposite faces are parallel planes. For example, the top - face (plane $STUV$) and the bottom - face (plane $OPQR$) are parallel. Also, the front - face (plane $PQUT$) and the back - face (plane $OSVR$), and the side - faces (plane $OPVS$ and plane $TURQ$) are pairs of parallel planes.

Answer:

Plane $STUV$ and Plane $OPQR$