Five marks exercise problem VII — task. Mathematics State Board, Class 10.

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Answer variants:

$4 \pi r^3$

$\frac{4}{3} π r^{3}$

$\frac{2}{3} π r^{3}$

$3 \pi r^2$

$2 \pi r^2$

$4 \pi r^2$

A right circular cylinder just enclose a sphere of radius

$r$ units.

Calculate:

(i) the surface area of the sphere

sq. units

(ii) the curved surface area of the cylinder

sq. units

(iii) the ratio of the areas obtained in (i) and (ii)

$i : i$

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13. Five marks exercise problem VII