Creating the rest of the octagon by mirror effect
- In the Copy window, choose Lines and Mirror. Be sure
the option Two Dimensions has been selected.
- Enter two points that define a vertical axis of symmetry, for example
(0, 0, 0) and (0, 10, 0).
- Choose Select and select the two sides of the octagon that have been
drawn. Press ESC to conclude the selection. (Figure 19)
- Repeat the process entering two points that define a horizontal axis of
symmetry, for example (0, 0, 0) and (10, 0, 0). This time select the four
sides of the octagon (Figure 20)