Question

a wheel has diameter 84 cm . Find how many complete revelations must it make to cover 3.168 km​

Answer 1

Answer:

$daimeter \: of \: wheel = 84cm$

$radius \: = 42cm = \frac{42}{10 0} m = 0.42m$

$length \: covered \: by \: wheel = 3168 \: m$

$then \: the \: distance \: of \: one \: revolution = 2 \pi \: r$

$2 \times \frac{22}{7} \times 0.42$

$2.64m \: in \: one \: revolution$

$number \: of \: revolution \: in \: 3168m = \frac{total \: length}{length \: of \: one \: rev..}$

$\: \: \: \: \: = \frac{3168}{2.64}$

$1200 \: times$