Math, asked by saachigarg, 1 year ago

2 concentric circles have their area in ratio 4:9 and the radius of the inner circle is 7cm. What is the diameter of the outer circle? ​

Answers

Answered by haridasan85
10

Answer:

Let AI is the area of the inner circle

A2 is the area of the outer circle

thenAi:A2 = 4:9

Area of inner circle πr 2 = 22x7^2/r=I54cm2

4:9=154: A2

A2 = 9x154/4=I386/4=346.5cm2

πR2=346.5

R2 = 346.5x7/22=110.25

R =v110.25=10.5

diameter of outer circle=lo.5x2

= 21cm

Answered by chandan8392
1

Answer:

10.5 cm

Step-by-step explanation:

10.5 cm

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10.5 cm

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