Question

Find the surface area of a hemisphere with a diameter of 26 cm. Round your answer to the nearest tenth.

Answer 1

The surface area of a sphere is $4 \pi r^{2}$.

Hence, the surface area of a hemisphere is half that, $2 \pi r^{2}$.

If the base is also included then the surface area will be $3 \pi r^{2}$.

Given,

Diameter = 26 cm

Therefore, Radius = $\frac{26}{2}$ = 13 cm

Thus, 

Area = $3 * \pi * 13^{2} = 3 * \pi * 169 = 507 \pi =$ = 1592.8 $cm^{2}$ [approx.]