Respuesta :
answer- undefined term is used to define an angle
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From the term line the term angle can be defined because when two lines intersect at a point an angle is formed. ... Therefore, the undefined term which is used to define the term an angle is line.
Step-by-step explanation:
Answer: line
Step-by-step explanation: In geometry, the three terms which are
considered to be undefined is line, point and plane.