6. Proving Geometric Relationships
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Mark BC in the figure.
Example Solutions: Plane ABC and plane BCF
Let's first mark BC in the figure.
There are only two planes that contain BC. The top of the cube and the back of the cube.
Two define these planes, we need three points that are contained within each of the planes. Top:& A,B and C Back:& B,C andF This gives us the two planes ABC and BCF.