A cylindrical glass is made up of steel whose internal radius is 7 cm and external radius is14 cm and and height is 10cm,then find its volume in cubic centimetre. (assuming the glass is uniform and the width of steel is same everywhere)
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Volume of the base = π × 1 4 2 × 7 = 4 3 1 2 c. c. assuming the value of π to be 7 2 2 .
Height of side wall is 1 0 − 7 = 3 cm. So it's volume is π × ( 1 4 2 − 7 2 ) × 3 = 1 3 8 6 c. c.
So the volume of the material of the container is 4 3 1 2 + 1 3 8 6 = 5 6 9 8 c. c.