A metal cylindrical disc is 3 cm thick and its external diameter is 14 cm. If its height is 5 cm, find its volume and total surface area.
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Answer:
inner diameter=14-6=8
radius=4
volume=π(7^2-4^2)h
= 22(49-16)*5/7
=22*33*5/7
=518.57cm3
total surface area=2π(R+r)(h+R-r)
= 2*22*(7+4)(7+5-4)/7
= 2*22*11*8/7
=553.14cm2
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