Any three numbers which are proportional to the direction cosines of a line, are called:

Question

Smart Achievers · Accepted Answer

(2)

Ans. direction ratios

Explanation:

Any three numbers which are proportional to the direction cosines of a line, are called the direction ratios of the line. If $l, m$ and $n$ are direction cosines and $a, b$ and $c$ are direction ratios of a line, then $a = λ l, b = λ m$ and $c = λ n$ for any non-zero $λ \in R$ .

Solution

Q.
Any three numbers which are proportional to the direction cosines of a line, are called:

1 direction angles

2 direction ratios

3 another set of direction cosines

4 none of the above

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