Question
A hollow garden roller 63 cm wide with a girth of 440 cm is made of iron 4 cm thick . he volume of he iron used is :
Answer: Option D
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Circumference of the girth = 440 cm.
`:.` ` 2 pi R = 440`
`rArr R = (440 xx 1/2 xx 7/22)` = 70 cm.
So, outer radius = 70 cm . Inner radius = (70 - 4) cm = 66 cm.
Volume of iron = `pi [(70)^2 - (66)^2] xx 63`
=`(22/7 xx 136 xx 4 xx 63) cm^3`
= 58752 `cm^3`
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