A circular mat has a diameter of 53 centimeters. Lily wants to sew a decorative braid around the mat. How many centimeters of braid does she need?

A girl wants to make a square-shaped figure from a circular wire of radius 49 cm. Determine the sides of a square.

The diameter of a circular park is 98 m. Find the cost of fencing it at $4 per meter.

 Find the area of a circular region whose radius is 21 m.

The diameter of a semicircular shape is 14 cm. What will be the perimeter of this shape?

 A metalworker cuts out a large semicircle with a diameter of 28 centimeters. Then the metalworker cuts a smaller semicircle out of the larger one and removes it. The diameter of the semicircular piece that is removed is 14 centimeters. Find the distance around the shape after the smaller semicircle is removed.

The tire of a car has a radius of 10.5 inches. How many revolutions does the tire need to make for the car to travel 13,200 inches?

A wheel makes 20 revolutions to cover a distance of 66 m. Find the diameter of the wheel.

The difference between the circumference and the diameter of a circular bangle is 5 cm. Find the radius of the bangle. (Take π = 22/7)

The diameter of a cart wheel is 2.1 m. Find the distance traveled when it completes 100 revolutions.