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∠BAC = 60°
∠BOC = 120°
The angle made by any arc of a circle on the alternate arc is half the angle made at the centre.
Kerala Syllabus 10th Standard Maths Solutions Chapter 5 Trigonometry - 19
The sides of the right angle triangle ΔCOD with angles 30°, 60°, 90° are proportional to the number 1 : √3: 2 .
Kerala Syllabus 10th Standard Maths Solutions Chapter 5 Trigonometry - 20
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