Question

find the daimeter of wheel of a car is 77cm. how many revolution will it make to travel 121km?​

Answer 1

Given ;

• diameter (d) = 77cm
• thus radius (r) :

$\frac{77}{2} cm$

Thus circumference (c) of the circle ;

$c = 2 \times \pi \times r \\ 2 \times \frac{22}{7} \times \frac{77}{2} \\ 2 \times 11 \times 11 \\ 2 \times 121 \\ 242cm$

Given ;

distance covered (D) = 121km

= 121 × 1000 = 121000m

=121000 × 100 = 12100000cm.

Thus for the number of revolutions (R) ;

$R = \frac{D}{c} \\ = \frac{12100000}{242} \\ = \frac{121 \times 100000}{242} \\ = \frac{1 \times 100000}{2} \\ = 50000 \: revolutios$

Answer = 50000 revolutions.

#answerwithquality

#BAL