All geometric figures.
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The three undefined terms are the point,the line and the plane.
The answer depends on which undefined terms the question refers to.
A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
We often call "undefined terms" variables. Their value is not known; it can vary. And thus the name we assign them is variable.
Undefined terms are numbers that con't be determined, like 1/0. Not to be confused with irrational numbers, though.