Question

The radius of the wheel is 49 cm. Find the estimated number of revolutions that the wheel makes to cover a distance of 6160 cm . (use pi=3.1415)

• A. 5
• B. 10
• C. 20
• D. 40

Answer 1

The correct option is C 20

$\text{Circumference of circle =}2\times \pi \times r$
$=2\times 3.1415\times 49$
$=307.867$

$\text{No. of revolutions =}\frac{Distance}{Circumference}$
$=\frac{6160}{307.867}$
$=20.008\approx 20$

So, the wheel makes 20 revolutions.