Find the distance between the point (-3,4,-6)and its image in the XY plane. Pls answer fast..dont give any links..pls give explanation

If a point of an object has coordinates (x, y, z) then the image of this point (as reflected by a mirror in the xy plane) has coordinates (x, y, -z).
Hence the coordinate of the image of the point(-3,4,-6) in xy-plane will be (-3,4,6).
So the distance between them will be d = (x2-x1)2+(y2-y1)2+(z2-z1)2=-3+32+4-42+6+62=(6+6)2=12

  • 0
What are you looking for?