# Equilateral triangles in the plane: equilateral_triangle

### 13.8.4 Equilateral triangles in the plane: equilateral_triangle

See Section 14.7.4 for equilateral triangles in space.

The equilateral_triangle command creates equilateral triangles.

- equilateral_triangle takes two mandatory arguments and one optional argument:
  - A,B, two points.
  - Optionally, var, a variable name.
- equilateral_triangle(A,B ⟨var⟩) returns and draws the equilateral ABC, where AB to AC is counterclockwise.
  With the argument var, C will be assigned to var.

#### Examples.

- Input:
  equilateral_triangle(0,2)
  Output:
- Input:
  equilateral_triangle(0, 2, C)
  Output:
  Input:
  affix(C)
  Output:

  ⎛
  ⎜
  ⎝

  √

  3

  i+1

  ⎞
  ⎟
  ⎠