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Question

In the given figure, seg AB is a diameter of the circle, m(arcAKC)=300. Find the value of m(arcBMC)..
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Solution

We are given ABC=30o, now we are to find BAC as this is the measure of arcBMC.
Now in the given figure if we join A and C then Δ ABC is right-angled triangle.[ As semi-circular angle is right-angle].
Then from Δ ABC we get ACB=90o and ABC=30o.
Then the remaining angle CAB will be of 60o.
So m(arcBMC)=60o.

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