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Q6. A car has wheels which are 80 cm in diameter. How many complete revolutions does each wheel make in 10 minutes, when the car is travelling at a speed of 66 km an hour?

Perimeter of Circle | Areas Related To Circles | CBSE | Class 10 | Math

Q4. A racetrack is in the form of a ring whose inner and outer circumference are 437 m and 503 m respectively. Find the width of the track and also its area.

Q5. The diameter of each wheel of a bus is 140 cm. how many revolutions per minute must a wheel make in order to move at a speed of 66 km per hour?