Question

The total surface area of a hemisphere of radius 7 cm is
(a) (588π) cm²
(b) (392π) cm²
(c) (147π) cm²
(d) (98π) cm²

Answer 1

(c) (147π) cm²

Radius of the hemisphere = 7 cm
Total surface area of the hemisphere = Curved surface area of hemisphere + Area of the circle$=3\mathrm{\pi }{r}^2$
$$\begin{gathered} =\left(3\mathrm{\pi }\times 7\times 7\right){\mathrm{cm}}^2 \\ =\left(147\mathrm{\pi }\right){\mathrm{cm}}^2 \end{gathered}$$