Question

6. A medicine capsule is in the shape of a
cylinder with two hemispheres stuck to each
of its ends (see Fig. 13.10). The length of
the entire capsule is 14 mm and the diameter
of the capsule is 5 mm. Find its surface area.​

Answer 1

Answer:

2×3.14×14×2.5 (2pieRH) = 219.8mm square

Answer 2

Answer:

Total area of the capsule =Curved surface area of the cylinder + curved surface area of 2 hemispheres

Curved surface area of the cylinder :

Diameter of a cylinder = 5mm

Radius of the cylinder = diameter/2 =5/2mm

hence, diameter of the hemisphere =5mm

So, radius of the hemisphere = diameter/2 =5/2mm

Now,

Height of the cylinder +2× Radius of the hemisphere =14mm

Height of cylinder = 14-2 ×Radius of hemisphere

=14-2×5/2 =9mm

Curved surface area of the cylinder =2πrh

=2×22/7×5/2×9

=990/7mm²