Question 252157
This might be a bit tough by explanation, but here it goes . . . 

step 1: draw a rectangular solid. Label the top verticies A, B, C, and D Starting from the top left and moving clockwise. Label the bottom verticies starting below the A with E, F, G, and H also clockwise.

step 2: identify your planes. BCEH is a plane. ADFG is a plane. CDEF is a plane. ABGH is a plane. They are all diagonal planes passing through the rectangular solid. 

step 3: identify lines of intersection. The pair of planes labelled BCEH and ADFG create a line in the solid. The pair of planes ABGH and CDEF also make a line in the solid. 

Hope that helps.