Question

if the diameters of the concentric circle shown in the figure below are in the ratio 1 : 2 : 3 then find the ratio of the areas of three regions.​

Answer 1

terrible at the topic

Answer 2

as diametres are in ratio of 1:2:3

then their radius is also in ratio of 1:2:3

for finding the ratio.

area of circle 1 : area of circle 2 : area of circle 3

pi×r1×r1:pi×r2×r2:pi×r3×r3

1:4:9