A right circular cylinder just encloses a sphere of radius r.
Find curved surface area of the cylinder.

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Solution

Just encloses means radius of sphere and cylinder will be same and height of cylinder would be equal to the diameter of the sphere.
i.e.
Radius of cylinder = $r$
Height of cylinder = $2 r$

Therefore, Curved Surface area of the cylinder = $2 π r h = 2 π r \times 2 r$ = $4 π r^{2}$

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Question 9 (ii)
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