About the Cover

Because of its long and varied history, the city of Los Angeles has excellent examples of modern and historic architecture. Architects use principles of geometry to create attractive and functional building designs. In these buildings, you can see circles, triangles, rectangles, prisms, and pyramids. You'll learn more about the two- and three-dimensional objects architects often use as the basis for building designs in Chapters 11 and 12.

Twisted torus. Created with Mathematica. A torus with rose-shaped cross section is constructed. Then the cross section is rotated around its center as it moves along a circle to form a twisted torus. For more information, and for programs to construct such graphics, see:
www.wolfram.com/r/textbook.