Question

Find the fvolume of a sphere whose radius is
(i) 2 cm (ii) 3.5 cm
(iii) 10.5 cm

Answer 1

(i) Radius of sphere (r) = 2 cm
$\therefore Volume=\frac{4}{3}\pi r^3=\frac{4}{3}\times \frac{22}{7}\times 2\times 2\times 2c{m}^3=\frac{704}{21}=33.52c{m}^3$
(ii) Radius of sphere (r) $=3.5cm=\frac{7}{2}cm$
$\therefore Volume=\frac{4}{3}\pi r^3=\frac{4}{3}\times \frac{22}{7}\times \frac{7}{2}\times \frac{7}{2}\times \frac{7}{2}c{m}^3=\frac{539}{3}=179.67c{m}^3$
(iii) Radius of sphere (r) $=10.5cm=\frac{21}{2}cm$
$\therefore Volume=\frac{4}{3}\pi r^3=\frac{4}{3}\times \frac{22}{7}\times \frac{21}{2}\times \frac{21}{2}\times \frac{21}{2}c{m}^3=4851c{m}^3$