Question 1
The distance between points A(1, 2, 3) and B(4, 6, 3) is: (NDA PYQ)
Question 2
The direction cosines of the x-axis are: (NDA PYQ)
A(0, 0, 1)
B(0, 1, 0)
C(1, 0, 0)
D(1, 1, 1)
Question 3
For any set of direction cosines (l, m, n), the identity satisfied is: (NDA PYQ)
Al + m + n = 1
Bl + m + n = 0
Cl² + m² + n² = 1
Dl²m²n² = 1
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