Question

the radius of a wheel of a car is 42 cm what is the diameter of the wheel​

Answer 1

Answer:

Radius of the wheel =r=42 cm (given)

Circumference of wheel = Circumference of circle = 2πr=2×

7

22

×42=264

Circumference of wheel is 264 cm.

Again, distance travelled by wheel = 19.8 km=1980000 cm (Convert km into cm)

Now, number of revolutions taken by a wheel = 1980000/264=7500