The unit vector in the direction from point A having
coordinate (1, –1, 2) to point B having coordinate
(–1, 1, 1) is
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The unit vector in the direction from point A having
coordinate (1, –1, 2) to point B having coordinate
(–1, 1, 1) is
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Given the points (1, –1, 2) & (–1, 1, 1)
You make a vector in the direction from one point to another by subtracting each starting coordinate from its respective ending coordinate:
V = (1+1)i +(-1-1)j+(2-1)k
v=2i-2j+k
| v|= √(2² + (-2)² + 1²) = √(4 + 4 + 1 )= √9 = 3
The unit vector in the direction from point A having
coordinate (1, –1, 2) to point B having coordinate
(–1, 1, 1) is = V/ |V| = (2i-2j+k)/3