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Chapter 1 Vocabulary

equidistant

equal or same distance

point

simplest term in geometry
distinct spot of identification

line

infinite number of points. Continues indefinitely in both directions

plane

extends without ending and has no thickness

collinear

points on the same line

coplanar

points on the same plane

intersection

two lines, rays, segments that meet or cross

noncollinear points

points not on the same line

segment

two points on the line and all the points between them. The two points are called the endpoints

ray

has one endpoint and continues to infinity in one direction

postulate

statement accepted as true

angle

formed by intersection of two rays

opposite rays

rays sharing a common endpoint but going in opposite directions

congruent

of equal or same measure

midpoint of a segment

a point which divides a segment in two equal smaller segments

bisector of a segment

is a line, segment, or ray or plane that intersects the segment at its midpoint

sides of an angle

the two rays which make up the angle

vertex

point at which two rays meet to form an angle.

acute angle

measure between 0 and 90

right angle

measures 90 degrees exactly

obtuse angle

measures between 90 and 180 degrees

straight angle

measures 180 degrees exactly. A straight line is a straight angle

protractor

measures the size of an angle

congruent angles

angles that have the same measure

adjacent angles

angles with a common side and common vertex

bisector of an angle

is the ray that divides the angle into two congruent adjacent angles

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