Question

If the ratio of the radii of a sphere and a
hemisphere is 3:5, then the ratio of its curved
surface area is
​

Answer 1

Answer:

18:25

Step-by-step explanation:

ratio of radii of sphere and a hemisphere =3:5

CSA of sphere =4pier²

CSA of hemisphere =2pie r²

ratio of CSA of sphere and hemisphere

=(4×22/7×3²)/(2×22/7×5²)

=2×3×3/5×5=18/25