find volume and surface area of sphere having radius 21
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given r = 21
applying formula 4/3×22/7×21×21×21
=38808
volume=38808
csa =2×22/7 ×21×21
=2772
applying formula 4/3×22/7×21×21×21
=38808
volume=38808
csa =2×22/7 ×21×21
=2772
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