SOLUTION: name a plane.
Algebra.Com
Question 208980:  name a plane. 
Answer by Theo(13342)   (Show Source): You can put this solution on YOUR website!
 if you mean in real life, then a plane can be a sheet of paper, a table top, the side of a building, the surface of the side of a cube, a wall in your house, etc.
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it has to be flat.
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you should be able to draw a line on it and then a point on it and then you should be able to connect both ends of the line to the point to form a triangle.
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was that your question?
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if you just want to give it a name, you can called it A, B, C, 1, 2, 3, etc.  i don't believe there are any naming restrictions.
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you should refer to it as plane a, plane b, etc to distinguish it between line a, triangle b, etc. if you are using the same names for different objects.
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was that your question?
 
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