The radius of a hemisphere is 4.5 cm. Find its surface area and its volume.

Hemisphere is half of a sphere

So the volume and area will be halved

But for total surface area there would be one more area which is the flat circle of a hemisphere

Radius of hemisphere = r = 4.5 cm =

Surface area of hemisphere = 3πr²

= 3 × ×

= 3 × ×

=

=

= 190.92 cm²

Volume of hemisphere = πr³

= × ×

=

=

= 190.92 cm³

Therefore, surface area is 190.92 cm² and volume is 190.92 cm³