![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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Points that lie on the same plane are called coplanar.
\Observe the figure;
\The points A, C, and J lie in plane ABC, but point D does not lie in the same plane
\ABC. So, the points are not coplanar.
\Points C, D, and J lie in a plane BCD, but point A does not lie in the same plane
\BCD. So, the points are not coplanar.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The points A, C, D, and J are not coplanar.
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