area of the shaded portion of the adjoining figure
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area of shaded portion = 100π - 16π = 84π = 12 x 22 = 264cm²
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Area of ring = pi*R^2-pi*r^2
R=10cm, r=4cm
=22/7*10^2-22/7*4^2
=22/7(10^2-4^2)
=22/7(100-16)
=22/7*84
=22*12
=264 cm^2
R=10cm, r=4cm
=22/7*10^2-22/7*4^2
=22/7(10^2-4^2)
=22/7(100-16)
=22/7*84
=22*12
=264 cm^2
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