Question

calculate the surface area of each of the following spheres
when:
b) r =4.5 cm​

Answer 1

Answer:

CSA of sphere is 4/3 pi r³

put value and solve

Answer 2

Answer:

Radius of the hemisphere =4.5 cm

We know that volume of the hemisphere

=

3

2

πr

3

=

3

2

π(4.5)

3

=190.928 cm

3

We know that the surface area of the hemisphere

=2πr

2

=2π×(4.5)

2

=127.285 cm

2

Hence, this is the answer.