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The radii of three concentric circles ar...

The radii of three concentric circles are in the ratio of 4:5:7. What is the ratio of the area between the two inner circles to that between the two outer circles ?
तीन संकेंद्रित वृत्तों की त्रिज्या 4: 5: 7 के अनुपात में है। दो बाहरी वृत्तों के बीच के दो वृत्तों के बीच के क्षेत्रफल का अनुपात क्या है?

A

`4 :7`

B

`5:9`

C

`4:5`

D

`3:8`

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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

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The radii of two cylinders are in the ratio 3:4 and their heights are in the ratio 8:5. The ratio of their volumes is दो सिलेंडरों की त्रिज्या 3: 4 के अनुपात में है और उनकी ऊँचाई 8: 5 के अनुपात में है। उनके आयतन का अनुपात है:

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A square has been inscribed in a circle. What is the ratio of the length of side of the square to the radius of the circle? एक वृत्त के अंदर एक वर्ग बनाया गया है| वर्ग की भुजा की लंबाई और वृत्त की त्रिज्या का अनुपात क्या है?

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