A sphere and a hemisphere have the same volume. The ratio

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Let the radius of sphere be r₁ units and that of hemisphere be r₂ units,
then,

	4	πr₁³ =	2	πr₂³
	3		3

⇒			r₁		³	=	1
			r₂				2

=	r₁	=	1	or 1 : ³√2
	r₂		³√2