Radius of a solid copper cylinder is 8.4 cm and its height is 32cm. How many disc of diameter 2.8cm and thickness o. 4cm can be made from the cylinder melting it.
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Step-by-step explanation:
Use π = 22/7, unless otherwise indicated
1. Find the volume of a cylinder whose
(i) r = 3.5 cm, h = 40 cm
(ii) r = 2.8 m, h = 15 m
Solution:
(i) Given,
r = 3.5 cm
h = 40 cm
By using the formula,
Volume of a cylinder = πr2h
= 22/7 × 3.5 × 3.5 × 40
= 1540 cm3
(ii) Given,
r = 2.8 m
h =15 m
By using the formula,
Volume of cylinder = πr2h
= 22/7 × 2.8 × 2.8 × 15
= 369.6 m3
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