If a line intersects two concentric circles (circles with the same centre) with centre O at A, B, C and D, prove that AB = CD (see Fig. 10.25).

In Figure,l is a line intersecting the two concentric circles,whose common centre is O, at the points A,B,C and D. Show that AB=CD

In Figure,l is a line intersecting the two concentric circles,whose common centre is O, at the points A,B,C and D. Show that AB=CD

Two circle with centres A and B intersect at C and D. Prove that /_ACB=/_ADB

In the figure given below,AD is a diameter of a circle with centre O.If AB II CD,prove that AB=CD

A straight line intersects thethree concentric circles at A, B, C. if the distance of line from the centre of the circles is 'P', prove that the area of the triangle formed by tangents to the circle at A, B, C is ((1)/(2P).AB.BC.CA) .

Given two concetric circles with centre O. A line cut the circle at A,B,C and D respectively. If AB=10cm, then find the length of CD.

In Figure,O is the centre of a circle and PO BISECTS /_APD .Prove that AB=CD

In the figure,two equal chords AB and CD of a circle with centre O ,intersect each other at E , Prove that AD=CB

In Fig common tangents AB and CD to two circles with centres O_1 and O_2 intersect at E. Prove that AB = CD.