## Basic Concepts of Geometry |

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Aabc angle sum apply assume base basic bisector called Chapter circle common concept congruent consider consistent construct contains contradicts convex COROLLARY corresponding defined definition determined disjoint distance distinct element endpoint equal equivalent Euclid's parallel postulate Euclidean geometry exactly example Exercise exists exterior angle false FIGURE formal given half-plane Hence holds hypothesis idea implies important incidence geometry interior interpretation intersection introduce joining least less line contains linear Lobachevskian geometry logical mathematical means measure meets midpoint neutral geometry noncollinear Note opposite opposite sides pair perpendicular plane Principle Proof properties Prove quadrilateral real number relation representation result right angle satisfy segment sense separation side Similarly statement suggests Suppose Theorem theory transverse treatment triangle unique Zabc Zdef