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किसी वृत्त की परिधि में 50% की कमी की गर्यी उसके क्षेत्रफल में प्रतिशत कमी ज्ञात करें?
A. `12.5%`
B. `25%`
C. `50%`
D. `75%`

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Correct Answer - D
यदि परिधि में 50% की कमी होती है तो त्रिज्या में भी 50% की कमी होती है।
`50%=(1to"decrement")/(2to"original")`
image
(`pi` is constant)
क्षेत्रफल में कमी
`=3/4xx100=75%`

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