Question

the diameter of a cycle wheel is 42cm how many revolution will it take to complete 1.98 km​

Answer 1

Answer:

$\tt 1500\: revolutions$

Step-by-step explanation:

$\tt Diameter= 42\:cm$

$\tt Radius=21\:cm$

$\tt We\: know\: that,$

$\boxed{\tt Circumference=2πr}$

$\tt : \implies 2×\dfrac{22}{7}×21$

$\tt : \implies 2×\dfrac{22}{\cancel{7}}×\cancel{21}\:\:3$

$\tt : \implies 2×22×3$

$\tt : \implies 44×3$

$\tt : \implies 132\: cm$

$\tt : \implies 0.00132\: km$

revolution will it take to complete 1.98 km:

$\dfrac{1.98}{0.00132}$

$: \implies1500$