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Q.16 How many times a wheel of radius 28 cm must rotate to go 352 m? (Take\( \pi =\frac{22}{7} \))
Answer :

Given: Radius of the wheel = 28 cm
\(\therefore Circumference = 2\pi r = 2 × \frac{22}{7} × 28 = 176 cm \)
Number of rotations made by the wheel in going 352 m or 35200 cm
\( =\frac{35200}{176} \)=200
Hence, the required number of rotation = 200.