What is the length of projection of \( \mathrm{P} \) \( \overrighta...

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What is the length of projection of
\( \mathrm{P} \) \( \overrightarrow{\mathrm{A}}=3 \hat{\mathrm{i}}+4 \hat{\mathrm{j}}+5 \hat{\mathrm{k}} \) on xy plane?
(1) 5
(2) 3
(3) \( 5 \sqrt{2} \)
(4) 4
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