What does “Direction ratios” actually mean in Vectors & 3D Geometry, and why does it matter for JEE?
the components that fix a line's or vector's direction in 3D space.
In simple words: the components that fix a line's or vector's direction in 3D space. Getting Direction ratios clear matters because JEE questions on Vectors & 3D Geometry usually test this idea directly, not just a formula you memorised.
Key point
Direction ratios
Common mistake
confusing direction ratios with direction cosines (which are normalised).
Memory tip
direction cosines are direction ratios divided by the magnitude.
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