The collection of all the points in a plane which are at a fixed distance from a fixed point in the plane is called 

A, B, C, D are four points of a circle in the order. A and C are the end points of a diameter, then ∠ADB can be

The region between an arc and the two radii joining the centre to the end points of the arc is called

In the adjoining figure, ∠AOC = 110^o, then ∠ABC =                 

In the given figure A, B and C are three points on a circle with centre O such that ∠BOC = 40^o and ∠AOB = 50^o.If D is a point on the circle other than the arc ABC, then ∠ADC =

In the following figure ABCD is a cyclic quadrilateral in which AC and BD are its diagonals.If ∠DBC = 60^o and ∠BAC = 40^o, then∠ BCD =                               

PQRS is a cyclic quadrilateral.If ∠Q = ∠R = 65^o, find ∠P and ∠S .

The central angle of an arc ABC is 220^o. Then ∠ABC is 

Sum of the angles of cyclic quadrilateral is

One angle of a cyclic quadrilateral is 60^o.Then its opposite angle is