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Question

Step 2. Draw an arc with radius r and B as centre on the first arc at C. So, COA is __.
Note: Answer in degrees.

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Solution

Statement: Draw an arc with radius r and B as centre on the first arc at C. So, COA is 120 .
Reason: As explained above, by cutting the circumference of a circle by an arc of equal radius the angle formed at the centre of the circle is 60 . The angle formed by repeating the step twice will be 2×60=120. So, COA is 120.


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