Question

the square?
B. If ratio of areas of two circles are 4:9, then what is the ratio of their circumference?
4. The radius of a circular wheel is 1.75 m. How many revolutions will it make in travelling 11
Crimumference of twn circles are respectively 88 m and 220 m. What is the difference in areas bet-​

Answer 1

Step-by-step explanation:

) 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

Answer 2

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