Question

The radius of the hemisphere is 18cm then its total surface area is​

Answer 1

$total \: surface \: area \: of \: hemispehre \: = 3\pi {r}^{2} \\ 3 \times \frac{22}{7} \times {18}^{2} \\ \frac{3 \times 22 \times 324}{7} \\ \\ \frac{21384}{7} = 3054.85 \\ = 3054$

Answer 2

Given→

Radius of hemisphere = 18 cm

To find→

Total surface area

Solution→

Total surface area of hemisphere

$= \frac{4}{3} π {r}^{3} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = \frac{4}{3} \times 3.14 \times {(18)}^{3} \: \: \: \: \: \: \: \: \: \: \: \\ = \frac{4}{3} \times 3.14 \times {(18)}^{2} \times 18 \: \\ = 4 \times 3.14 \times 324 \times 6 \: \: \: \: \: \: \: \\ = 12.56 \times 1944 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 24416.64 \: {cm}^{3} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$