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प्रश्न
If the difference between outer and inner radii of a circular ring is 14 cm, then the difference between outer and inner circumferences, is ______.
रिकाम्या जागा भरा
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उत्तर
If the difference between outer and inner radii of a circular ring is 14 cm, then the difference between outer and inner circumferences, is 88 cm.
Explanation:
Let outer and inner radii be R and r with R – r = 14.
Difference of circumferences = 2πR – 2πr
= 2π(R – r)
= 2π·14
= 28π cm ...(= 88 cm if π = `22/7`, ≈ 87.96 cm if π ≈ 3.1416)
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