Three-dimensional space - Introduction to AutoCAD 2011: 2D and 3D Design - page 366

11. Fig. 17.52 shows in a View Block/Isometric view a semicircle of radius 25 constructed in the View

Cube/Top view on a layer of colour Magenta with a semicircle of radius 75 constructed on the
View Block/Front view with its left-hand end centred on the semicircle. Fig. 17.53 shows a surface
constructed from the two semicircles in a Visual Styles/Realistic mode.

Fig. 17.52 Exercise 11 - the circle and semicircle Fig. 17.53 Exercise 11