Question

In the figure 'o' is the centre of the circle and A and B are points on the circle

a) Find the measurement of angle A?
b) What is the radius of the circle?
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Answer 1

Answer:

as centre angle is 60 degree so by taking perpendicular bisectors from O. the interior angle will be 180degree . so by using this concept we get 60 degree at measurement of A .

and it become equilateral triangle and hence radius become 5cm.