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  4. If the projections of a line of length d on the coordinate axis are d1, d2 and d3 respectively then d12+d22+d32=

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

Solution:

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