Question

The diameter of the wheel of a car is 70 cm.How many revolutions will it take to travel 1.65 km?

Answer 1

Answer:

Step-by-step explanation:

Very rough estimate, to avoid being wrong on scale: 70*3=210(cm). Call it 2 metres. So how many 2 metres are in 1,650. 825 revolutions. Call it 700–750ish to compensate for earlier underestimation. 700 is the very rough number we are looking for.

70*(22/7) cm, so call it 7*(22/7)cm for 22cm and multiply by 10 for 2.2 metres per revolution.

Use 22 metres and multiply by 10 after.

1650/22=75, but as it’s 2.2 metres, the answer is 750 revolutions. This complies with the rough estimate at the start,

Answer = 750 revolutions taking 22/7 as the value of pi

Answer 2

Diameter of wheel = 70cm
Radius of wheel = 70/2 = 35cm
Circumference of wheel = 2pie r = 2×22/7×35 = 220cm
convert into cm---
Distance covered by wheel = 1.65×1,00,000=165/100×1,00,000=1,65,000cm
Number of revolution = Distance covered by wheel/circumference of wheel =
1,65,000/220 = 750 revolutions