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geometry

the measure of the earth

point

the smallest possible unit of measure

line

an infinite number of connected points

collinear

two or more points on the same line

ray

part of a line having a definite starting point and proceeding in one direction only

line segment

a finite or measurable piece of a line

similar

two geometric figures whose angles are congruent and whose sides have the same ratio

equal

equal

congruent

having the same size and shape

endpoint

starting point or origin of a ray