Answer :

A medicine capsule is in the shape of a cylinder with two hemisphere stuck to each of its ends.


Total length of entire capsule = 14 mm


Diameter of capsule = 5 mm


Radius of capsule = r = Diameter ÷ 2 = 5/2 mm = 2.5 mm


Length of cylindrical part of capsule = l = Total length of entire capsule – 2 × Radius of capsule


= 14 – 2 × 2.5 mm = 14 - 5 mm = 9 mm


Curved surface area of cylindrical part of capsule = 2πrl


= 2 × 3.14 × 9 × 2.5 mm2


= 141.3 mm2


Curved surface area of hemispherical ends = 2 × 2πr2


= 2 × 2 × 3.14 × 2.5 × 2.5 cm2


= 78.5 mm2


Surface area of capsule = Curved surface area of cylindrical part of capsule + Curved surface area of hemispherical ends


Surface area of capsule = 141.3 mm2 + 78.5 mm2 = 219.8 mm2


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