4 (1) θ (2)8 (3)2 (4) parallel or in the plane (5) parallel or intersecting (6) intersecting or out of the plane.

5*** surface

6 because AA '/bb' and AA' = bb' are parallelograms,

So ab/= a' b' and BC/= B' c' are the same, so,

7 3; three

8 27

Group b:1(1) c (2) d (3) c.