Two concentric circles form a ring. The inner and outer circumferences of the ring are 22 cm and 44 cm, respectively. The width of the ring is: (take π = 22/7)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e 3.5 cm.
| Understanding/Application |
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Let the radius of the inner and outer circle be r1 and r2. Circumference of the inner circle = 22 cm 2πr1 = 22 r1 = 3.5 cm |
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Circumference of the outer circle = 44 cm 2πr2 = 44 r2 = 7 cm Width of the ring = r2 - r1 = 7 - 3.5 = 3.5 cm |