In Geometry, undefined notions like lines and angles are concepts understood intuitively without formal mathematical definitions.
Undefined notion in Geometry refers to concepts that are not formally defined but are understood intuitively. An example of an undefined notion is a line, as its definition relies on an intuitive understanding rather than a precise mathematical description. Another example is an angle, where the concept is visually understood but lacks a strict mathematical definition. These undefined notions highlight the importance of intuitive understanding in Geometry.
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