Posted by **Math's Noob** on Wednesday, January 11, 2012 at 12:53am.

A hollow spherical metal ball has internal radius 1cm. If the metal is 1/2 cm thick, find the volume of metal ( Take pi equals 22/7)

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**Reiny**, Wednesday, January 11, 2012 at 8:58am
outer radius = 1.5 cm

volume (if solid metal) = (4/3)π r^3

= (4/3) π (1.5)^3

= 4.5π

Hollow part = (4/3)π(1^3 = 4π/3

so volume of metal = (9/2)π - (4/3)π

= (19/6)π

or appr. 9.95 , (nobody uses 22/7 for π, we all have calculators)

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