A point.
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Point
A point. To learn why and more about circles go to this website: windowseat.ca/circles
an angle whose measure is between 90 and 180
It is a very basic concept which cannot be defined. Undefined terms are used to define other concepts. In Euclidean geometry, for example, point, line and plane are not defined.
Point is not an undefined term. It can be defined as a mathematically precise location, or as the place where two lines intersect.