The points A,F,B are coplanar, A,C,B are not coplanar, F,E,B,C are not coplanar and C,D,G,H are coplanar.
Given two planes on which there are points named A,B,C,D,E,F,G,H,I.
We are required to find the points which are coplanar.
Two points are said to be coplanar which lie on the same plane.
The points lie on horizontal plane are:A,B,D,E,F,G,I
The points which lie on vertical plane:C,D,E,F,G,H
The combinations are:
1)A,F,B,
2)A,C,B
3)F,E,B,C,
4)C,D,G,H.
Wee have found various points which lie on both the planes, so,
A,F,B are coplanar,
A,C,B are not coplanar,
F,E,B,C are not coplanar,
C,D,G,H are coplanar.
Hence the points A,F,B are coplanar, A,C,B are not coplanar, F,E,B,C are not coplanar and C,D,G,H are coplanar.
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