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Byju's Answer
Standard XII
Mathematics
Obtaining Centre and Radius of a Circle from General Equation of a Circle
If the radius...
Question
If the radius of the circle
x
2
+
y
2
−
18
x
+
12
y
+
k
=
0
be 11, then k =
A
347
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B
4
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C
-4
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D
49
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Solution
The correct option is
C
-4
(
R
a
d
i
u
s
)
2
=
g
2
+
f
2
−
c
or 121 = 81 + 36 - k
Or k = -4.
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10
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Q.
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