Circles - ix

Diagonals of a cyclic quadrilateral are the diameters of thai circle, then quadrilateral is a

In how many parts a plane can divides a circle if it intersect perpendicular ?

Given a circle of radius 5 cm and centre O. OL is drawn perpendicular to the chord AB. If OL = 3 cm, then length of chord AB is

Given three collinear points, then the number of circles which can be drawn through three points are

Given a chord AB of length 5 cm, of a circle with centre 0 . OL is perpendicular to chord AB and OL = 4 cm. OM is perpendicular to chord CD such that OM = 4 cm. Then CM is equal to

Given two concentric circles with centre O. A line cuts the circles at A, B, C, D respectively ifAB = 10 cm then length CD is