Question

Find the direction cosines of the straight line joining the points (1,2,-4) and (2,1,-3).

Answer 1

Answer:

Step 1:

The direction ratios of the line joining these points are

x

2

−x

1

,y

2

−y

1

,z

2

−z

1

(i.e)(3−2),(−2−3),(1−(−1))

⟹ we get (1,−5,2)

Step 2:

Its direction cosines are :

30

1

,−

6

5

,

15

2

Answer 2

Answer:

√1square plus 1squara plus _4 square equal 2,1,-3