Write down the direction cosines of staight line joi.ing two points 423 and 457
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The direction ratios of the line joining these points are (x²- x¹), (y²- y¹), (z²- z¹)
(i.e) (4 - 5), (4 - 2), (4 - 2)
> ( - 5,4,4)
its direction cosines are
- 1 ÷ √5²+4²+4², 1 ÷ √5²+4²+4², 1 ÷ √5²+4²+4²
> -1 ÷ √13, -1 ÷ √13, -1 √13
(i.e) (4 - 5), (4 - 2), (4 - 2)
> ( - 5,4,4)
its direction cosines are
- 1 ÷ √5²+4²+4², 1 ÷ √5²+4²+4², 1 ÷ √5²+4²+4²
> -1 ÷ √13, -1 ÷ √13, -1 √13
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