In the given figure A,B,C and D are four points on a circle.AC and BD intersect at a point E such that ∠BEC = 150^o and∠ ECD = 30^o.Then ∠BAC =

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 =                               

Which one of the following may be the central angle of minor arc.

The length of the complete circle is called its

Which one of the following may be the central angle of a major arc.

Cyclic parallelogram is a 

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

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

Sum of the angles of cyclic quadrilateral is

Two circles of radii 4 cm and 6 cm touch each others, then distance between their  centres when they touch internally is