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
300
450
600
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
Incorrect answer
Option 2)
450
Incorrect answer
Option 3)
600
Correct answer
Option 4)
750
Incorrect answer
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