The component of a vector $A$ at an angle $\theta$ to itself is,

\[A_x=A\cos\theta\]

At right angle, \[A_x=A\cos90°=0\]

Hence, the magnitude of component of a vector right angle to itself is zero.

The component of a vector $A$ at an angle $\theta$ to itself is,

\[A_x=A\cos\theta\]

At right angle, \[A_x=A\cos90°=0\]

Hence, the magnitude of component of a vector right angle to itself is zero.

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