Plzzzzzzz Help ... Kal exam hai .
Q.1) Find the direction cosines and direction ratios of line joining the points :-
i.} A ( 0 ,0 ,0 ) , B (4, 8 , -8 )
I WILL MARK BRAINLIEST .
Answers
Answered by
0
direction ratios joining points A and B is
<4,8,-8>
I.e., <1,2,-2>
now √1+(2)^2+(-2)^2
√1+4+4
√9
3
thus the direction cosines are
<1/3,2/3,-2/3>
<4,8,-8>
I.e., <1,2,-2>
now √1+(2)^2+(-2)^2
√1+4+4
√9
3
thus the direction cosines are
<1/3,2/3,-2/3>
Answered by
0
Directional ratios (dr) of line through A(x1,y1,z1) and B(x2,y2,z2) is
±(x2-x1,y2-y1,z2-z1)
where as directional cosines(dc) are directional ratios with magnitude as 1.
According to problem; dr is ±(4-0,8-0,-8-0) = ±(4,8,-8)
while dc is ±(4,8,-8)/[√(4²+8²+(-8)²)] = ±(1/3,2/3,-2/3)
Similar questions