Q.

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

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a

Direction sines

b

Direction ratios

c

Direction angles

d

Direction tangents

answer is B.

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Detailed Solution

The Ordered triad which are proportional to the direction cosines of a line are called direction ratios. There are infinite sets of direction ratios but there is only two sets of direction cosines to any line.
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Any numbers which are proportional to the direction cosines of a line, are called