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

If the diameter of a semicircular protractor is 14 cm , then its perimeter is:

The length of a minute hand on a wall clock is 7 cm. Then the area swept by it in 30 minutes 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 length of the rope by which a cow must be tethered so as to graze an area of 9856 m² is :

The difference between the radii of the smaller circle and the bigger circle is 7cm and the difference between the areas of the two circles is 1078 cm². Then , the radius of the smaller circle is

If the circumference of a circle is 66 cm , then the area of the circle is

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

A chord of a circle of radius 14 cm subtends a right angle at the centre. Then , the area of the minor sector is :

The area of a circle is increased by 22cm² , when its radius is increased by 1 cm. The original radius of the circle is: