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# How many times a wheel of radius 28 cm must rotate to go 352 m?

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

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It is given that radius of wheel is $28\; cm$

Now, we know that

Circumference of circle = $2 \pi r$

$\Rightarrow 2 \pi r = 2 \times 3.14 \times 28 = 175.84 \ cm$

Now, number of rotation done by wheel to go 352 m  is

$\Rightarrow \frac{352 \ m}{175.84 \ cm} = \frac{35200}{175.84}\cong 200$

Therefore,  number of rotation done by wheel to go 352 m is  200

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