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Question

If the projections of a line segment on the coordinates axes are 3, 4 and 5 then its length is equal to ____________.

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Solution

Since coordinates of a line segment from coordinate axes are 3, 4 and 5 then length is given by
3-02+4-02+5-02
=9+16+25=25+25=50=5×2×5
i.e length is 52

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