Answer:
(b) \[|\vec{A}+\,\vec{B}|\,\,=\,|\vec{A}{{|}^{2}}\Rightarrow
\,(\vec{A}+\vec{B})\,.\,(\vec{A}+\vec{B})\,=\vec{A}\,.\,\vec{A}\]
\[\therefore \,\theta
={{180}^{o}}\]
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