Two concentric circles with centre o have radii 21 cm and 42 cm. If angle AOB=60, find the area of the shaded region.
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area of outer circle =22/7 ×42×42
=5544sq.cm
area of inner circle =22/7×21×21
=1386sq.cm
area of shaded region=outer-inner
=5544sq.cm - 1386sq.cm
=4158sq.cm
=5544sq.cm
area of inner circle =22/7×21×21
=1386sq.cm
area of shaded region=outer-inner
=5544sq.cm - 1386sq.cm
=4158sq.cm
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