Question 1 Answer the following questions regarding the solid model.

(1) CSG (Constructive Solid Geometry) expresses a solid by combining basic solids called primitives by set operation. Please answer all of (a) to (d) which solids cannot be represented by the difference between the primitives of the rectangular parallelepiped A and one triangular prism B (A-B) shown in Fig. 1. However, the answer group is represented by a two-dimensional plane of the XZ plane.

N M A B B Answer group Z L. GOOD (a) (b) (c) (d) Fig 1 Constructive Solid Geometry