Question

Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 7 cm. [2 MARKS]

Answer 1

Formula: 0.5 Mark each
Application: 0.5 Marks each

$r=7cm$

(i) The curved surface area
$=2\pi r^2$

$=2\times \frac{22}{7}\times 7^2$

$=308{cm}^2$

(ii) The total surface area of the hemisphere
$=3\pi r^2$

$=3\times \frac{22}{7}\times 7^2$

$=462{cm}^2$