(Q7)Find the volume and surface area of a sphere of radius 2.1 cm (π =
22
7
)
2.1cm
Radius of sphere(r) =
cm
Surface area of sphere = 4πr
2
= 4 ×
22
7
× (
2
) = 4 ×
22
7
×
10
×
10
=
25
=
cm
2
Volume of sphere =
4
3
πr
3
=
4
3
×
22
7
× (
)
3
=
4
3
×
22
7
×
×
×
=
cm
3
Clear