यदि एक वृत्त की परिधि 33 सेमी है, तो इसका क्षेत्रफल कितना है?

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Bihar STET Paper I: Mathematics (Held In 2019 - Shift 1)
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  1. \(​\frac{21}{4}\) सेमी2
  2. 42 सेमी2
  3. \(\frac{693}{8}\) सेमी2
  4. \(\frac{8}{693}\) सेमी2

Answer (Detailed Solution Below)

Option 3 : \(\frac{693}{8}\) सेमी2
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दिया गया है:

वृत्त की परिधि = 33 सेमी

प्रयुक्त अवधारणा:

वृत्त की परिधि = 2πr,

जहाँ "r" वृत्त की त्रिज्या है।

एक वृत्त का क्षेत्रफल = πr2

गणना:

C = 2πr

⇒ 33 = 2πr

⇒ r = \(\dfrac{21}{4}\)

⇒ क्षेत्रफल = π × \(\dfrac{21}{4}^2\)

क्षेत्रफल\(\dfrac{22 \times 21 \times 21}{7 \times 4 \times 4}\) = \(\dfrac{693}{8}\)

∴ वृत्त का क्षेत्रफल \(\dfrac{693}{8} \) सेमीहै

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