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# Triangle bac to the diameter is angle acb=50°, the angle bac=40° which diameter is ________?

Do you mean that a triangle is inscribe for in a circle? In this case, the sum of the angles in a triangles is 180 degrees, thus if you subtract the two other angles you would get that angle abc equals 90 degrees which means that it is the angle against the diameter of the circle (AC).  Simeon Davchev
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