# A line  AB in three-dimensional space makes angles 450 and 1200  with the positive -axis and the positive -axis respectively. If AB makes an acute angle with the positive -axis , than equals Option 1) 300 Option 2) 450 Option 3) 600 Option 4) 750

As we learnt in

Direction Cosines -

i)

ii)    If OP =r then the co-ordinates of P will be (lr,mr,nr)

iii)    Direction cosines of X-axis are (1,0,0)

iv)    Direction cosines of Y-axis are (0,1,0)

v)    Direction cosines of Z-axis are (0,0,1)

-

Direction angles,

Given

We know that,

Option 1)

300

Option 2)

450

Option 3)

600

Option 4)

750

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