15. O is the centre of the circle AB = BC = AC = 10 Cm

C С

a) <AOB = 30°

b) What is the radius of the circle?

c) Find the area of the circle?

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Answer:Given : AB = BC = AC = 10 cm

∴ ΔABC is an equilateral triangleb Radius of circumscribe circle of equilateral triangleRadius of circle = 5.77 cm