The circumference of a circle whose area is 81πr², is
A. 9πr

B. 18πr

C. 3πr

D. 81πr

A circular flower bed is surrounded by a path 4 m wide. The diameter of the flower bed is 66 m. What is the area of this path?

Shazli took a wire of length 44 cm and bent it into the shape of a circle. Find the radius of that circle. Also find its area. If the same wire is bent into the shape of a square, what will be the length of each of its sides? Which figure encloses more area, the circle or the square?

A circular pond is surrounded by a 2 m wide circular path. If outer circumference of circular path is 44 m, find the inner circumference of the circular path. Also find area of the path.

A circular flower garden has an area of about 314 m². A sprinkler at the center of the garden can cover an area that has a radius of 12 m. Will the sprinkler water the entire garden? (Take π = 3.14)

The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in 1 hour?

A circle of radius 2 cm is cut out from a square piece of an aluminum sheet of side 6 cm. What is the area of the left over aluminum sheet?

Find the circumference of the inner and the outer circles, shown in the adjoining figure.

If the circumference of a circular sheet is 154 m, find its radius. Also, find the area of the sheet.

Find the area of the following circles, given that :

(a) Radius = 14 mm

(b) Diameter = 49 m

(c) Radius = 5 cm

Find the circumference of the circles with the following radius:

(a) 14 cm (b) 28 mm (c) 21 cm