Question

If the ratio of surface areas of two spheres is 25:36 then the ratio of their radii is

B)5:2


C)5:6


D)225:1296


A)2:5​

Answer 1

Answer:

Surface area of cube 6x

2

surfacearea2ndcube

surfacearea1stcube

=

36

25

6b

2

6a

2

=

36

25

⇒

b

a

=

36

25

i. e

b

a

=

6

5

=5:6

volume of cube x

2

volumeof2ndcube

volumeof1stcube

=

b

3

a

3

b

3

a

3

=

6

3

5

3

=

216

125

∴ Ratio of volume

=125:216