Question

Find the TSA of a hemisphere of radius $5$cm.

Answer 1

We know that the total surface area of hemisphere with radius $r$ is $TSA=3\pi r^2$.

It is given that the radius of the hemisphere is $5$ cm, therefore,

$TSA=3\pi r^2=3\times \frac{22}{7}\times (5{)}^2=3\times \frac{22}{7}\times 25=\frac{1650}{7}=235.71$cm${}^2$

Hence, the total surface area of the hemisphere is $235.71$ cm${}^2$.