The area of a circle is increased by 22 cm2 when its radius is increased by 1 cm. The original radius of the circle is
The circumference of a circle is 11 cm and the angle of a sector of the circle is 60°. The area of the sector is
In the figure the radius of the circle is 1 centimetre. The vertices of the square are points on the circle. The area of the unshaded region is:
In the figure a circle is fixed exactly inside the square. Without looking at the figure, if we put a dot the probability of the dot being inside the circle is :
In the figure, BC is a chord and PA is a tangent to the circle. PB=4 centimetres, PA=6 centimetres, the length of the chord BC is:
O is the centre of the circle, and AB is a chord. P is a point on AB. PA=3 centimeters, PB-8 centimeters, OP= 5 centimeters what is the radius of the circle?