Figure 9 shows the projections of the object. In the top view, the highest portions of the object are visible. The top face ABCDE is at the top and is completely visible in the top view. In the top view, edges ab, bc, cd, de and ea are shown as full lines. The bottom pentagonal faces A1B1C1D1E1 is smaller than the top face, hence invisible. The slant edges AA1, BB1, CC1, DD1 and EE1 are invisible in the top view, hence they are shown as lines of dashes. The line connecting a visible point and an invisible point is shown as an invisible line of dashes unless they are out lines.
In the front view, the front faces of the object are shown as visible. The faces ABB1A1 and BCC1B1 are the front faces. Hence in the front view, the corners a, b, c and a1, b1, c1 are visible to the observer. Hence in the front view, the lines a’a’1, b’b’1 and c’c’1 are shown as full lines. However the corners d, e, d1 and e1 are invisible in the front view. The lines, e’e’1, d’d’1 are invisible, hence shown as dashed lines. The top rear edges a’e’, e’d’ and d’c’ coincide with the top front visible edges a’b’ and b’c’.
Figure 9. Projections of the frustrum of a pentagonal pyramid.
In the side view - the face lying on that side are visible. As seen in the left side view, the corners e, a, b and e1, a1, b1 lie on left side and are visible in the left view. Hence the lines, e”e1”, a”a1” and b”b1” are shown as full lines. The edges d”d1”, c”c1” coincide with the visible edges e”e1” and a”a1” respectively.