(x - 0)2 + (y - 0)2 = 72 and (x - 4)2 + (y - 0)2 = 74
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(x + 9)2 + (y + 12)2 = 36 (x + 16)2 + (y + 3)2 = 17
let the two circles with centre O and P are congruent circles, therefore their radius will be equal. given: AB and CD are the chords of the circles with centres O and P respectively. ∠AOB=∠CPD TPT: AB=CD proof: in the ΔAOB and ΔCPD AO=CP=r and OB=PD=r ∠AOB=∠CPD therefore by SAS congruency, ΔAOB and ΔCPD are congruent triangle. therefore AB=CD
Join the centre of the circle O and the point A .Extend it to both sides to form a line.This is the required locus
Circles with the same radius are congruent circles.
Concentric circles are circles with the same common centre.