13.9.2  Rhombuses in the plane: rhombus

See Section 14.8.2 for rhombuses in space.

The rhombus command creates rhombuses.

• rhombus takes three mandatory arguments and two optional arguments.
  • A,B, two points.
  • a, a real number.
  • Optionally, varc, vard, two variable names.
• rhombus(A,B,a ⟨varc,vard⟩) returns and draws the rhombus ABCD, where a is the counterclockwise angle from AB to AC. If the arguments varc and vard are given, then C and D will be assigned to them.

Examples.

• Input:
  rhombus(-2*i, sqrt(3) - i, pi/3)
  Output:
  
• Input:
  rhombus(-2*i, sqrt(3) - i, pi/3, C, D)
  Output:
  
  Input:
  affix(C), affix(D)
  Output:

  √

  3

  + i, 0