Question:
1.Find the distance between ( -3, 4, -6) and its image in the XY – plane.
Answer:
If a point has coordinate (x, y, z), then the image of this point in the xy-plane has coordinate is (x, y, -z)
Hense, the image of point (-3, 4, -6) in the xy-plane is (-3, 4, 6)
Now, the distance between the points is = √{(-3 + 3)2 + ( 4 - 4)2 + (6 + 6)2 }
= √(12)2
= 12
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