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OpenStudy (anonymous):
A:A plane is an undefined term because it can be named using three noncollinear points B: is described generally, not using a formal definition C:is where other geometric shapes can be constructed D:is a flat surface that extends indefinitely in all directions
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Directrix (directrix):
Plane, point, and line are the three undefined terms of Geometry. If plane is undefined, then it has no formal definition. (Those last two words are a strong hint as to which objective is correct.) @bigbadboyfrank
OpenStudy (anonymous):
B?
Directrix (directrix):
Correct, that is what I got.
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