- Apoint
- Btriangle
- Csquare
- Dcircle
Step-by-Step Solution
Although Euclid attempted definitions, terms like point, line and plane are now treated as undefined (primitive) terms in modern geometry.
Answer: A) point
A term that is left UNDEFINED in Euclid's geometry (a primitive/undefined term) is:
Class 9Euclid's AxiomsGeometry — Foundations
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