First slide

Direction ratios and direction cosines

Question

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

Very Easy

A

Direction sines
B

Direction ratios
C

Direction angles
D

Direction tangents

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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