A spherical tank is 21 cm in diameter. Find the surface area and volume.
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Step-by-step explanation:
d = 21 cm
r = 21/2
surface area of sphere = 4πrsquare
= 4×22/7×21/2×21/2
=1386 cm square
volume of sphere =4/3πrcube
=4/3÷22/7×21/2×21/2×21/2
=4851 cm cube
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