Q. The area of the shaded portion is 770 cm 2  in the given figure. If the circumference of the outer circle is 132 cm, find the width of the shaded portion.

 

Hi, here let outer radius is R and inner radius is r so πR2-r2= 770 also 2πR= 1322×227×R= 132R = 132×744= 21so  in πR2-r2= 770 227212-r2= 770441-r2= 245r2= 196 r = 14 So width = R-r = 21-14 = 7 cm 

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