If a line has direction ratios 2, -1, -2, determine its directio

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 Multiple Choice QuestionsShort Answer Type

1. If a line makes angles 90°, 135°, 45° with x, y and z-axes respectively, find its direction cosines.
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2.

Can a directed line have direction angles 45°, 60°, 120°?

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3. Can a directed line have direction angles 45°, 45°, 60°?
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4.

A line makes an angle of straight pi over 4 with each of y-axis and z-axis. Find the angle made by it with x-axis. 

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5. Find the direction cosines of x, y and z-axis.
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6. Find the direction-cosines of a line which makes equal angles with the axes. How many such lines are there?
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7.

If a line has direction ratios 2, -1, -2, determine its direction cosines. 


Direction ratios of the line are 2, –1,–2.
Dividing each by square root of left parenthesis 2 right parenthesis squared plus left parenthesis negative 1 right parenthesis squared plus left parenthesis negative 2 right parenthesis squared end root space equals space square root of 4 plus 1 plus 4 end root space equals space square root of 9 space equals space 3. the direction cosines of line are 2 over 3 comma space minus 1 third comma space minus 2 over 3.
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8.

If a line has direction ratios 2, -1, -2, determine its direction cosines. 

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9. If a line has the direction ratios – 18, 12, – 4. then what are its direction cosines?
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10. Find the direction ratios and the direction cosines of the lines joining the pairs of points:
 (–2, 1, 0), (3, 2, 1).
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