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⤵
Surface area=25×20=500cm
2
Volume of tank=4.5ℓ=4500cm
3
Initial height of water=
500
4500
=9cm
∴Rise in water=11−9=2cm
Volume of water rise=volume of cube
⇒500×2=a
3
⇒a=
1000
=10cm
Therefire edge=10cm
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