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R1=36/1=18
R2=18/2=9
R3=AB/6
Area of shaded region = area of big semi circle - 2* area of semi circle -area of circle
1/2*22/7*18*18-2*1/2*9*9-22/7*6*6
22/7(9*18-9*9-6*6)
22/7(162-81-36)
22/7(162-117)
22/7(45)
990/7cm^2
R2=18/2=9
R3=AB/6
Area of shaded region = area of big semi circle - 2* area of semi circle -area of circle
1/2*22/7*18*18-2*1/2*9*9-22/7*6*6
22/7(9*18-9*9-6*6)
22/7(162-81-36)
22/7(162-117)
22/7(45)
990/7cm^2
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