Question

The radius of a circular wheel is 42 cm. Find the distance travelled by it in:

(i) 1 revolution;

(ii) 50 revolutions;

(iii) 200 revolutions;

The distance travelled by a wheel in one revolution is equal to its circumference.

Answer 1

(i)Radius of wheel, r =42 cm

$\therefore$ Circumference i.e. distance travelled in 1 revolution $=2\pi r$

$=2\times \frac{22}{7}\times 42$

=264 cm

(ii)Distance travelled in 50 revolutions

$=264\times 50$

=13200 cm

=132 m

(iii)Distance travelled in 200 revolutions

$=264\times 200$

=52800 cm

=528 m

Hence (i)264 cm (ii)132 m (iii)528 m