CircleMedium
Question
lx + my + n = 0 is a tangent line to the circle x2 + y2 = r2, if -
Options
A.l2 + m2 = n2 r2
B.l2 + m2 = n2 + r2
C.n2 = r2(l2 + m2)
D.none of these
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