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Byju's Answer
Standard IX
Mathematics
Perpendicular from the Center to a Chord Bisects the Chord
Locus of cent...
Question
Locus of centre of circle touching the straight lines 3x+4y=5 and 3x+4y=20 is
(a)3x+4y=15
(b)6x+8y=15
(c)3x+4y=25
(d)6x+8y=25
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Solution
Hi
,
Since
these
two
points
are
parallel
so
distance
of
center
from
these
points
will
be
same
and
hence
let
centre
is
h
,
k
so
3
h
+
4
k
-
5
3
2
+
4
2
=
±
3
h
+
4
k
-
20
3
2
+
4
2
So
takinge
negative
sign
as
poisitive
sign
will
get
cancelled
,
6
h
+
8
k
=
15
So
required
answer
is
6
x
+
8
y
=
15
Regards
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