किसी अर्द्धवृत की परिधि क्या होगी जिसकी त्रिज्या 21 सेमी है।

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ISRO SHAR Technician B Fitter 29 April 2018 Official Paper
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  1. 42 सेमी
  2. 66 सेमी
  3. 87 सेमी
  4. 108 सेमी

Answer (Detailed Solution Below)

Option 4 : 108 सेमी
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दिया गया है:

अर्धवृत्त की त्रिज्या = 21 सेमी

प्रयुक्त अवधारणा:

1. अर्धवृत्त की परिधि = πR + 2R (R = त्रिज्या)

2. π = 22/7

गणना:

अब, अर्धवृत्त की परिधि

⇒ π × 21 + 2 × 21

⇒ 22/7 × 21 + 2 × 21

⇒ 108 सेमी

∴ 21 सेमी त्रिज्या वाले अर्धवृत्त की परिधि 108 सेमी है।

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