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BASICS OF 3 D GEOMETRY
Image of a point (x,y,z) in the xy plane is (x,y,-z).
Image of (x,y,z ) in the YZ plane is (-x,y,z)
Image of ( x,y,z) in the XZ plane is (x,-y,z)
Also learn about the distance formula and section formula by viewing these problems. In Section formula, we have internal and external division. To understand more, watch these videos.