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The diameters of two circles are the sid...

The diameters of two circles are the side of a square and the diagonal of the square. The ratio of the areas of the smaller circle and the larger circle is

A

`1:2`

B

`1:4`

C

`sqrt(2):sqrt(3)`

D

`1:sqrt(2)`

Text Solution

Verified by Experts

The correct Answer is:
A

मानाकि वर्ग की भुजा a है
`therefore` वर्ग का विकर्ण `=sqrt(2)a`
`therefore` छोटे वृत्त की त्रिज्या `=(a)/(2)`
`therefore` क्षेत्रफल `=pixx((a)/(2))^(2)=(pia^(2))/(4)`
बड़े वृत्त की त्रिज्या `=(sqrt(2)a)/(2)=(a)/(sqrt(2))`
`therefore` क्षेत्रफल `=pixx((a)/(sqrt(2)))^(2)=(pia^(2))/(2)`
`("छोटे वृत्त का क्षेत्रफल")/("बड़े वृत्त का क्षेत्रफल")=(pia^(2)//4)/(pia^(2)//2)=(2)/(4)=(1)/(2)`
`=1:2`
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