Introduction to 3DEasy
Question
P ≡ (x1, y1, z1) and Q ≡ (x2, y2, z2 ) are two points if direction cosines of a line are l, m, n then projection of PQ on AB a are -
Options
A.
(x2 – x1) + 
(y2 − y1) + 
(z2 − z1)
(x2 – x1) + (y2 − y1) + (z2 − z1)B.l (x2 − x1) + m (y2 − y1) + n (z2 − z1)
C.
[ l (x2 − x1 ) + m (y2 − y1) + n (z2 − z1)]
[ l (x2 − x1 ) + m (y2 − y1) + n (z2 − z1)]D.None of these
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