Question

The areas of two circles are in ratio 9:4 , find the ratio of their radii.​

Answer 1

The ratio of their circumferences is. R1R2=32=2πR12πR2=32

this is ans

a) Area of two circles in ratio =4:9

πr

1

2

:πr

2

2

=4:9

r

2

2

r

1

2

=

9

4

r

2

r

1

=

3

2

Circumference =2πr

1

:2πr

2

=

2π×3

2π×2

=2:3

Answer = 2:3

b)Circumference of circle ratios =3:4

⟹

r

2

r

1

=

4

3

Area of circles =

πr

2

2

πr

1

2

=

r

2

2

r

1

2

=

4

2

3

2

=

16

9

=9:16

Answer = 9:16

solve this method