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  1. The radius of a wheel is 21 cm. How many revolutions will it make in travelling 924 metres ? (use π = 22/7)
    1. 7
    2. 11
    3. 200
    4. 700
Correct Option: D

Using Rule 7,
Circumference of wheel = 2πr

= 2 ×
22
 × 21 cm. = 132 cm
7

∴ Number of revolutions =
92400
 = 700
132


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