Q. 21

What are the direction cosines of the y-axis?

Answer :

To find : Direction cosines of the y- axis

Formula used : If a line makes angles αo, βo and γo with the positive directions of x-axis, y-axis and z-axis respectively. then direction cosines are given by , ,

y-axis makes 90 o with the x and z axes

α = 90o, β = 0 o and γ = 90 o

Direction cosines of the line is

, ,

0, 1, 0

Direction cosines of the line is 0, 1 , 0

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