Question

Find the volume of a sphere whose radius is
(i) 7 cm 
(ii) 0.63 m

Answer 1

(i) Radius of sphere = 7 cm 
Volume of sphere =\(\frac{4}{3}\pi r^3\)
= \(\frac{4}{3}\) × \(\frac{22}{7}\) × 7 cm × 7 cm × 7 cm
\(= \frac{4312}{3}\) cm³
= 1437.33 cm³
Therefore, the volume of the sphere is 1437 cm³ .

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(ii) Radius of sphere = 0.63 m 
Volume of sphere =\(\frac{4}{3}\pi r^3\)
= \(\frac{4}{3}\) × \(\frac{22}{7}\) × 0.63 m × 0.63 m × 0.63 m
= 1.047816 m³
= 1.05 m³ (approx.)
Therefore, the volume of the sphere is 1.05 m³ (approximately).