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Q7. A broach is made with silver wire in the form of a circle with diameter 35 mm. The wire is also used in making 5 diameters which divide the circle into ten equal sectors. Find the total length of the silver wire required.

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

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?

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?