test if a given triangle is a right triangle
The routine tests if the given triangle ABC is a right triangle. It returns true if ABC is a right triangle; false if it is not; and FAIL if it is unable to reach a conclusion.
If FAIL is returned, and the optional argument is given, the condition that makes ABC a right triangle is assigned to this argument. It will be either of the form expr=0 or of the form &or⁡expr_1=0,expr_2=0,...,expr_n where expr, expri_i are Maple expressions.
The command with(geom3d,IsRightTriangle) allows the use of the abbreviated form of this command.
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