(In reply to
re: Why Angle A? by levik)
On giving it more thought, I realized that if Angle C were obtuse, then in the right triangle AMD, the leg MD (17) would be longer than the hypotenuse AD (10), which is impossible. So the assumption that angle C is acute is verified.
It still brings up the question why irrelevant information about angle A was mentioned in the initial conditions of the problem.

Posted by TomM
on 20020701 10:03:34 