Class 12MathematicsTHREE DIMENSIONAL GEOMETRYSystem of co-ordinates, Direction cosines and direction ratios, Projection
MediumIf the projections of a line on the coordinate axes are $2, -1, 2$,then the length of the line is
- A$3$
- B$4$
- C$2$
- D$\frac{1}{2}$
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