13.9.1  Squares in the plane: square

See Section 14.8.1 for squares in space.

The square command creates squares.

• square takes two mandatory arguments and two optional arguments.
  • A,B, two points.
  • Optionally, varc, vard, two variable names.
• square(A,B ⟨varc,vard⟩) returns and draws the square ABCD, where the square is traversed counterclockwise.
  If the arguments varc and vard are given, then C and D will be assigned to them.

Examples.

• Input:
  square(0,1+i)
  Output:
  
• Input:
  square(0,1+i,C,D)
  Output:
  
  Input:
  affix(C), affix(D)
  Output:

  2 i,−1+i