Intersection of Curved Solids (平面与立体相交)

When a plane intersects surfaces of a solid, a definite edge is formed. The definite edge is called the intersection of the plane and the solid. The plane is called an intersecting plane. The planar areasurrounded by the intersection (loops of lines or curves) is called a section (see Fig.3-11). Common seen engineering cut-solids are shown in Figure 3-12.