1. Points, Lines, and Planes
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The answer is in the words. Compare coplanar with colinear.
Coplanar points lie on the same plane.
Collinear points lie on the same line.
Points that are coplanar are points that lie on the same plane. The following three points are an example of coplanar points. They all lie on the x,y coordinate plane.
Points that are colinear are points that lie on the same line. The following three points are collinear. We can connect them with a straight line.