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Explain solution RD sharma class 12 chapter 24 Vector or cross product exercise Fill in the blanks question 12

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Hint: If three vectors are collinear they will be parallel to each other

Given: Three points with position vectors

\vec{a},\vec{b} & \vec{c}

Then we know

\left |\vec{a} \times \vec{b} \right |=\left |\vec{a} \right |\left | \vec{b} \right | \sin \theta

\vec{a} & \vec{c} are collinear then they must be parallel


\sin \theta =0\\ \therefore \theta =0\\

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