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Byju's Answer
Standard VII
Mathematics
RHS Criteria for Congruency
If O, A, B, C...
Question
If O, A, B, C and D are five points, such that
3
O
D
→
+
D
A
→
+
D
B
→
+
D
C
→
=
k
(
O
A
→
+
O
B
→
+
O
C
→
)
then k = ________________.
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Solution
Given:
3
O
D
→
+
D
A
→
+
D
B
→
+
D
C
→
=
k
(
O
A
→
+
O
B
→
+
O
C
→
)
3
O
D
→
+
D
A
→
+
D
B
→
+
D
C
→
=
k
O
A
→
+
O
B
→
+
O
C
→
⇒
O
D
→
+
D
A
→
+
O
D
→
+
D
B
→
+
O
D
→
+
D
C
→
=
k
O
A
→
+
O
B
→
+
O
C
→
⇒
O
D
→
+
D
A
→
+
O
D
→
+
D
B
→
+
O
D
→
+
D
C
→
=
k
O
A
→
+
O
B
→
+
O
C
→
⇒
O
A
→
+
O
B
→
+
O
C
→
=
k
O
A
→
+
O
B
→
+
O
C
→
⇒
O
A
→
+
O
B
→
+
O
C
→
=
k
O
A
→
+
O
B
→
+
O
C
→
⇒
1
=
k
Hence, k =
1
.
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0
Similar questions
Q.
A, B, C, D, E are five coplanar points such that
D
A
→
+
D
B
→
+
D
C
→
+
A
E
→
+
B
E
→
+
C
E
→
=
k
D
E
,
→
then k = ___________________.
Q.
A, B, C, D, E are five coplanar points such that
D
A
→
+
D
B
→
+
D
C
→
+
A
E
→
+
B
E
→
+
C
E
→
=
λ
D
E
→
,
Then
λ
=
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
.
Q.
If
A
,
B
,
C
,
D
and
E
are five coplanar points, then the value of
¯
D
A
+
¯
D
B
+
¯
D
C
+
¯
A
E
+
¯
B
E
+
¯
C
E
, is equal to
Q.
The points
O,A,B,C,D are
such that
¯
¯¯¯¯¯¯
¯
O
A
=
a
,
¯
¯¯¯¯¯¯
¯
O
B
=
b
,
¯
¯¯¯¯¯¯
¯
O
C
=
2
a
+
3
b
and
¯
¯¯¯¯¯¯¯
¯
O
D
=
a
−
2
b
. If
|
a
|
=
3
|
b
|
, then the angle between
¯
¯¯¯¯¯¯¯
¯
B
D
,
¯
¯¯¯¯¯¯
¯
A
C
is
Q.
If A, B, C, D, E are five points in a plane such that
A
B
→
+
A
E
→
+
B
C
→
+
D
C
→
+
E
D
→
=
k
A
C
→
,
then the value of k is _______________.
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