Basic Concepts in Geometry

These are undefined basic concepts

These are undefined basic concepts in geometry. A point has no dimension, a line extends infinitely in both directions (straight line), and a plane is

On a number line

On a number line, each point corresponds to a number called its coordinate. Distance between two points is found by subtracting the smaller coordinate

For three collinear points P

For three collinear points P, Q, R, point Q is between P and R if d(P,Q) + d(Q,R) = d(P,R). This is written as P-Q-R. Only one of the three points can

Segment AB includes points

Segment AB includes points A, B and all points between them. Ray AB starts at A and extends through B infinitely in one direction. Line AB extends inf

Two segments are congruent if they

Two segments are congruent if they have equal lengths: seg AB ≅ seg CD if l(AB) = l(CD). Congruence follows reflexive, symmetric, and transitive prope