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Mathematics, 26.01.2021 08:50 82coogs

The figure shows two sectors in which the arcs AB and CD are arcs of concentric circles, centre 0. BD = AC = 4 cm and angle AOB = 1/2 radians. If the perimeter of ABDC is 16cm, calculate
(a) OB,
(b) the area of ABDC.

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