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The radii of three concentric circles ar...

The radii of three concentric circles are in the ratio 4 : 5 : 7 . What is the ratio of the area between the two inner circles to that between the two outer circles?
तीन संकेंद्री वृत्तों की त्रिज्याएँ 4 : 5 : 7 के अनुपात में हैं | दो आतंरिक वृत्तों के बीच के क्षेत्रफल तथा दो बाह्य वृत्तों के बीच के क्षेत्रफल के बीच अनुपात ज्ञात करें

A

`4:7`

B

`5:9`

C

`4:5`

D

`3:8`

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