Co ordinate geometry : - ( Orthogonal circles ; Solving problems ) - 78.

Co ordinate geometry is one of the most important and exciting ideas of mathematics. It provides a connection between algebra and geometry through graphs of lines and curves.
The circle: is defines as the locus point which moves in a plane such that its distance from a fixed point in the plane is always constant. The fixed point is the center, and the fixed distance is the radius.
Orthogonal circles : If two circles intersecting at right angle.
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