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A bicycle wheel makes $2, 500$ revolution in moving $11\ km$. Find the circumference of the wheel.
Given: A bicycle wheel makes $2500$ revolution in moving $11\ km$.
To do: To find the circumference of the wheel.
Solution:
Let the radius of the wheel be $r$ cm.
Distance covered by the wheel in one revolution$=\frac{11}{5000}\ km = 220\ cm$
$2\pi r=220$
$2\times\frac{22}{7}\times r=220$
$r=35\ cm$
Diameter$=2r=70\ cm$
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