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12.7.4  Equilateral triangles in space: equilateral_triangle

See section 11.8.4 for equilateral triangles in the plane.

The equilateral_triangle command takes as arguments three points, A, B and P.

equilateral_triangle returns and draws the equilateral triangle ABC, where C is in the same half plane as P.
Input:

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

then:

equilateral_triangle(A,B,P)

Output:

triangle_rectangle can take an optional fourth argument, which is a variable which will be assigned to the third vertex of the triangle.
Input:

triangle_rectangle(A,B,P,C)

then:

simplify(coordinates(C))

Output:

[(-3*sqrt(6)+6)/4,(-3*sqrt(6)+6)/4,(3*sqrt(6)+3)/2]

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