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).

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I am a Primary Teacher. I have been teaching for over 8 years and I have been tutoring for around 4 years now in English in KS1 and KS2, and Maths in KS1, KS2 and KS3 (up to Year 9) I provide a calm, friendly, safe and encouraging environment for the children to learn in. I promote a positive mindset and encouragement for the children to try their best. If they make mistakes that is ok, that is how we learn.

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