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Mathematics
Mathematics
Problem
l
x
+
m
y
+
n
=
0
lx + my + n = 0
l
x
+
m
y
+
n
=
0
is a tangent line to the circle
x
2
+
y
2
=
r
2
x^2 + y^2 = r^2
x
2
+
y
2
=
r
2
, if - (A)
l
2
+
m
2
=
n
2
r
2
l^2 + m^2 = n^2 r^2
l
2
+
m
2
=
n
2
r
2
(B)
l
2
+
m
2
=
n
2
+
r
2
l^2 + m^2 = n^2 + r^2
l
2
+
m
2
=
n
2
+
r
2
(C)
n
2
=
r
2
(
l
2
+
m
2
)
n^2 = r^2(l^2 + m^2)
n
2
=
r
2
(
l
2
+
m
2
)
(D) None of these
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