Multiple choice

Find the area of the ring between two concentric circles, whose circumference are 88 cm. and 132 cm. दो संकेद्रीय वृत्तों के घेरे के बीच का क्षेत्रफल ज्ञात कीजिये जिनकी परिधि 88 सेमी. और 132 सेमी. है।

  1. 780 cm.2/सेमी.2

  2. 770 cm.2/सेमी.2

  3. 715 cm.2/सेमी.2

  4. 660 cm.2/सेमी.2
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B Correct answer
Explanation

From circumference 2πr = 88 and 132, we get r = 14 cm and 21 cm. The ring's area is π(21² - 14²) = π(441 - 196) = 245π ≈ 770 cm².

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