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# A petrol tank is a cylinder of base diameter 21 cm and length 18 cm fitted with the conical ends each of axis length 9 cm. Determine the capacity of the tank.

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In this question we have to determine the capacity
of the tant a petrol tank is a cylinder of base
diameter 21 cm and length 18 cm fitted with the
conical ends each of axis length 9 cm.

This question is from r d sharma class 10 maths.
I found this question while doing mensuration of
class 10.
I need help in getting the solution.

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1. Given,

Base diameter of the cylindrical base of the petrol tank = 21 cm

So, its radius (r) = diameter/2 = 21/2 = 10.5 cm

Height of the Cylindrical portion of the tank (h1) = 18 cm

Height of the Conical portion of the tank (h2) = 9 cm

Now, we know that

The volume of the Cylindrical portion (V1) = Ï€r2 h1

V1 = Ï€(10.5)2 18

V1 = 6237 cm3

The volume of the Conical portion (V2) = 1/3 Ã— 22/7 Ã— r2 Ã— h2

V2 = 1/3 Ã— 22/7 Ã— 10.52 Ã— 9

V2 = 1039.5 cm3

Therefore, the total volume of the tank (V) = 2 x volume of a conical portion + volume of the Cylindrical portion

V = V1 + V2 = 2 x 1039.5 + 6237

V = 8316 cm3

So, the capacity of the tank = V = 8316 cm3

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