यदि किसी वृत्त की त्रिज्या को 8 गुना बढ़ा दिया जाए, तो उसकी परिधि वृत्त की पिछली परिधि से कितनी गुना बढ़ जाएगी?

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RPF SI (2018) Official Paper (Held On: 24 Dec, 2018 Shift 1)
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  1. 7
  2. 9
  3. 10
  4. 8

Answer (Detailed Solution Below)

Option 4 : 8
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दिया गया है:

वृत्त की प्रारंभिक त्रिज्या = r

वृत्त की नई त्रिज्या = 8r

प्रयुक्त सूत्र:

वृत्त की परिधि = 2πr

गणना:

प्रारंभिक परिधि = 2πr

नई परिधि = 2π(8r)

नई परिधि = 16πr

परिधि में वृद्धि = नई परिधि / प्रारंभिक परिधि

⇒ परिधि में वृद्धि = 16πr / 2πr

⇒ परिधि में वृद्धि = 8

वृत्त की पिछली परिधि से परिधि 8 गुना बढ़ जाती है।

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