The radius of central prostration centers in the given shape is 1.4 centimeters and 3.5 centimeters and angle AOC is 40 degrees, the area of the shadowed part is known.
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area of shaded part= area of big circle -area of small circle
= 22/7 ×3.5 -22/7×1.4
=11-4.4
=6.6cm
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