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12.8 cm28. From a cubical piece of wood of side 21 cm, a hemisphere is carved ouin such a way that the diameter of the hemisphere is equal to the side othe cubical piece. Find the surface area and volume of the remainingpiece.20 A |
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Answer» Cubical volume =21*21*21=9261cm3cubical surface area =6*21*21=2646cm2diameter = side of cubical piece radius =diameter/2r=21/2=10.5cmvolume of new side =10.5*10.5*10.5=1157.625cm3surface area of new side =6*10.5*10.5=661.5cm2 volume of remaining piece =9261-1157.625=8103.375cm2surface area remaining piece 2646-661.5=1984.5cm2 |
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