Question
What are the d.c's of the line whose d.r's are 1. -2.
and 3?Solution
ATQ,
We are given the direction ratios (d.r's) of a line as = 1,−2,3 To find the direction cosines (d.c's), use the formula: 
Where a=1, b=−2, c=3
Compute magnitude:
Then, thedirection cosines will be:
So the d.c's are: Therefore, option 4 is correct answer
More Previous year papers Questions
- Determine the final value of this expression:
(1/5) of {5⁴ - 24 × 14 + 12 × 18 - 10.5 of 10²} 3% of 842 ÷ 2% of 421 = ?
√225 + 27 × 10 + ? = 320
- Determine the value of ‘p’ if p = √529 + √1444
45 % of 180 + √144 * 8 = ?2 + 70 % of 80
Determine the value of 'p' in following expression:
720 ÷ 9 + 640 ÷ 16 - p = √121 X 5 + 6²- 7?2 = √20.25 × 10 + √16 + 32
- What will come in place of the question mark (?) in the following questions?
(2⁴ + 6²) ÷ 2 = ? 18(1/3) + 9(2/3) – 10(1/3) = 1(2/3) + ?
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