Question

the diameter of two silver discs are in the ratio 2 : 3 what will be the ratio of their areas

Answer 1

Area of a disc A = pi * d^2/4

Given d1:d2=2:3

from the area formula we get area is directly proportional to square of diameter

so a1:a2 = (d1/d2)^2

a1:a2= 4:9

any doubts comment ;)

Answer 2

HII,,,....,,,
Silver discs are spherical...
Area of circle is πr².
1st disc area/2nd disc area=π(2/2)²/π((3/2)²
=1/(9/4)
Hence,
ratio of two discs are 1:9/4.