Question 128

The radius of a wheel is 21 cm what is the distance (in cm) travelled by the wheel in 10 revolutions?

Solution

Circumference of wheel $$(r=21)$$ = $$2\pi r$$

= $$2\times\frac{22}{7}\times21=132$$ cm

Distance covered in 1 revolution = Circumference of wheel = $$132$$ cm

=> Distance covered in 10 revolutions = $$132\times10=1320$$ cm

=> Ans - (B)

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