Discussion
The distance covered (in metres) by a wheel of radius 25 cm in 350 rounds is (use \(\pi = \frac{22}{7}\)) :
Answer: C
The wheel covers 550 metres.
In one round the wheel covers its circumference:
\[ \begin{aligned} 2\pi r &= 2 \times \tfrac{22}{7} \times 25 = \tfrac{1100}{7} \text{ cm} \\ 350 \times \tfrac{1100}{7} &= 55000 \text{ cm} = 550 \text{ m} \end{aligned} \]
1100 m comes from using the diameter 50 cm as the radius, and 275 m from using \(\pi r\) instead of \(2\pi r\).
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