Two circles of equal radii 'r' cut orghogoanlly If their centres are `(-2 ,3)` and `(-5 ,-6)` then `r`=

Two circleS of equal radius ' r ' cut orthogonally. If their centres are (2,3) and (5,6), then r=

Two circleS of equal radius ' r ' cut orthogonally. If their centres are (2,3) and (5,6), then r=

Two circles of equal radius a cut orthogonally . If their centres are (2,3) and (5,6) then radical axis of these circles passes through the point

Two circles of equal radius a cut orthogonally. If their centres are (2,3) and (5,6), then radical axis of these circles passes through the point

Two circles of equal radii cut each other at P and Q, so that the centre of one lies on the other.A straight line through P cuts the circle again at A and B.Prove that Delta QAB is equilateral triangle.

Two -circles of equal radii pass through each other's centre show that the length of the arc cut off from any circle by the other is equal to one theird the length of its circumference.

If two circles of the same radius r and centres at (-1,2) and (3,6) respectively cut orthogonally,then the value of r is

If the circles of same radius 'a' and centres at (2, 3) and (5, 6) cut orthogonally, then a =