Make: Trigonometry

Chapter 4. Coordinate Systems and Analytic Geometry

3D printed models used in this chapter

See Chapter 2 for directions on where and how to download these models.

• axes.scad
  • This model creates various coordinate planes, and a set of coordinate axes.
• helicoid.scad
  • This model creates a helicoid shape sized to the polar coordinate model.
• r(theta).scad
  • This model creates an Archimedean spiral sized to the polar coordinate model.

You will also need

• Some aluminum foil
• A pipe cleaner (sometimes called a “chenille straw”)

One of the most familiar things in any math textbook is a grid with arrows marking the direction of increasing x, y, or some other variable. We saw three-dimensional examples in Chapter 2 when we introduced OpenSCAD. ...