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# A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank. - CBSE Class 9 - Mathematics

ConceptVolume of a Sphere

#### Question

A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

["Assume "pi=22/7]

#### Solution

Inner radius (r1) of hemispherical tank = 1 m

Thickness of hemispherical tank = 1 cm = 0.01 m

Outer radius (r2) of hemispherical tank = (1 + 0.01) m = 1.01 m

"Volume of iron used to make such a tank "=2/3pi(r_2^3-r_1^3)

=[2/3xx22/7xx{(1.01)^3-(1)^3}]m^3

= [44/21xx(1.030301-1)]m^3

= 0.06348 m3              (approximately)

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Mathematics Class 9 (2018 to Current)
Chapter 13: Surface Area and Volumes
Ex. 13.80 | Q: 6 | Page no. 236

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Solution A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank. Concept: Volume of a Sphere.
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