The perimeters of a circular and a square field are equal. If the area of the square field is 484 m², then the diameter of the circular field is:

The length of the rope by which a cow must be tethered so as to graze an area of 9856 m² is :

If the perimeter of a semicircular protractor is 36 cm , then its diameter is:

Area of sector of a circle with radius R and of angle P is

If an arc makes an angles of 72^o at the centre of a circle of radius 10 cm, then its length is:

The area between two concentric circles having radii 70 cm and 50 cm is:

A wheel makes 1000 revolutions in covering a distance of 88 km. Then , the diameter o the wheel is:

The perimeter of a sector of angle 45^o of a circle with radius 7 cm is:

The length of a minor arc is ²/9 of the circumference of the circle. Then , the measure of the angle subtended by the arc at the centre of the circle is:

The difference between the circumference and radius of a circle is 37 cm. Then area of the circle is