Question

find the total surface area of a hemisphere of radius r/2 unit​

Answer 1

Answer:

3πr

2

The surface area of a sphere of radius r is 4πr

2

. Half of this is 2πr

2

.

If you have a hemispherical object then it has a base which is a circle of radius r.

The area of a circle of radius r is πr

2

and thus if the hemisphere is meant to include the base then the surface area is 2πr

2

+πr

2

=3πr

2

.

Answer 2

Step-by-step explanation:

3πr

2

The surface area of a sphere of radius r is

2

. Half of this is 2πr

2

If you have a hemispherical object then it has a base which is a circle of radius r.

The area of a circle of radius r is t

2

and thus if the hemisphere is meant to include the base then the surface area is

2

+Tr

2

=3πr

2