A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. How much medicine (in mm³) is needed to fill this capsule?

Radius of capsule r = 3.5/2 = 1.75 mm
Volume of medicine to fill the capsule = = 4/3πr³
= 4/3 × 22/7 × 1.75 × 1.75 × 1.75
= 4/3 × 22 × 0.25 × 1.75 × 1.75
= 22.46 mm³ (approx)
Hence, 22.46 mm³ medicine is required to fill this capsule.