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The figure below, ADC is a chord of a circle with centre 0 passing through A, B and C. BD is a perpendicular bisector of AC. AD = 3 cm and BD = 1 cm. (Take #pi#=3.142)
Calculate:
(a) the radius OA of the circle.
(b) the area of the sector OABC.
(c) the area of the segment ABCD.