Q. If the projections of a line of length $d$ on the coordinate axis are $d_{1}, d_{2}$ and $d_{3}$ respectively then $d_{1}^{2} + d_{2}^{2} + d_{3}^{2} =$

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A

$2 d^{2}$

8%

B

$3 d^{2}$

62%

C

$d^{2}$

8%

D

$5 d^{2}$

23%

Solution:

Correct answer is (c) $d^{2}$