Question

Please Write a proof correctly... ​

Answer 1

Answer:

I can give proof in Chinese if you want

Answer 2

PROOF: M is the centre if circle

therefore AC is the diameter

therefore angle AMC = 180

also angle AMC =2 angle ABC

(since the angle subtended by an arc at the centre is double the angle subtended by the arc at any other point on the circle)

therefore , angleAMC =2 angle ABC

180 = 2 angle ABC

THEREFORE,angle ABC = 90 degree.

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