CircleEasy
Question
Two given circles x2 + y2 + ax + by + c = 0 and x2 + y2 + dx + ey + f = 0 will intersect each other orthogonally, only when-
Options
A.ad + be = c + f
B.a + b + c = d + e + f
C.ad + be = 2c + 2f
D.ad + be = 2c + 2f
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