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Byju's Answer
Standard XII
Mathematics
Dot Product of Two Vectors
If a →, b → a...
Question
If
a
→
,
b
→
are non-zero vectors such that
a
→
.
b
→
=
-
a
→
b
→
,then the angle between
a
→
and
b
→
is _________________.
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Solution
Given:
a
→
.
b
→
=
-
a
→
b
→
a
→
.
b
→
=
-
a
→
b
→
⇒
a
→
b
→
cos
θ
=
-
a
→
b
→
⇒
cos
θ
=
-
1
⇒
θ
=
π
Hence, the angle between
a
→
and
b
→
is
π
.
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