1.Which is NOT an undefined term in geometry?

1.Which is NOT an undefined term in geometry?
a. angle
b. line
c. plane
d. points
These words are point, line and plane, and are referred to as the "three undefined terms of geometry".
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A. Angel
In geometry, formal definitions are formed using other defined words or terms. There are, however, three words in geometry that are not formally defined. These words are point, line and plane, and are referred to as the "three undefined terms of geometry"