Equilateral triangles in space

See Section 26.7.4 for equilateral triangles in the plane.

The equilateral_triangle command returns and draws equilateral triangles.

equilateral_triangle takes three mandatory arguments and one optional argument:
- A,B,P, three points.
- Optionally, var, a variable name.
equilateral_triangle(A,B,P ⟨,var⟩) returns and draws equilateral triangle ABC, where C and P are on the same side of line AB in plane ABP.
If the argument var is given, it will be assigned the value of C.

A,B,p:=point(0,0,0),point(3,3,3),point(0,0,3); equilateral_triangle(A,B,P)

A,B,P:=point(0,0,0),point(3,3,3),point(0,0,3); equilateral_triangle(A,B,P,C); simplify(coordinates(C))

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