See Section 27.6.4 for equilateral triangles in space.
The equilateral_triangle command creates equilateral triangles.
With the argument var, C will be assigned to var.
| equilateral_triangle(1/2+i/2,4+i) |
| equilateral_triangle(1/2+i/2,4+i,C) |
| evalc(affix(C)) |
|