Find the area of a ring lying between the circumferences of two concentric circles whose radii are 10.5 cm and 7 cm.
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Area of the circle with radius 10.5 is 22/7×10.5×10.5=346.5 and Area of the circle with radius 7 is 22/7×7×7=154 then to find area of the ring we have to subtract the area of circle with eadiius 7 from area of circle with radius 10.5 so now we subtract 346.5-154=192.5
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