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31 Cards in this Set

  • Front
  • Back


no size, no dimension

represented by a dot


one dimension

represented by a line with 2 arrowheads


two dimensions

flat surface

extends in all directions

named by at least 3 points

Line Segment

two endpoints


part of a line with one endpoint

opposite rays

same endpoint

opposite directions


two points on same line

coplanar points

2 points on same


a statement that is accepted without proof


a rule that must be proved true

ruler postulate

allow you to measure in the length of segments

Segment Addition Postulate

If B is between A and C then AB+BC=AC

If AB+BC=AC then B is between A and C.

Congruent Segments

have equal length


divides a segment into two congruent segments

Segment Bisector

a line, ray, or segment that intersects a seg at its midpoint


consists of two rays with a common endpoint

Protractor Postulate

allows us to measure the size of angles in degrees

Angle Addition Postulate

if P is on the interior of Angle ABC, then the measure of angle ABP+the measure of angle PBC= the measure of angle ABC

Congruent Angles

have equal measure

Angle Bisector

a ray that divides an angle into 2 congruent angles

Complementary Angles

a pair of angles whose sum is 90

Supplementary Angles

a pair of angles whose sum is 180

Adjacent Angles

A pair of angles that share a vertex on the side but have no common interior points

Linear Pair

two adjacent angles are a linear pair if their non common sides form opposite rays

Linear Pair Postulate

angles in a linear pair are supplementary

Vertical Angles

2 angles are vertical angles if their sides form two pairs of opposite rays


Formed by 3 or more sides and each side intersects exactly two other sides, one at each endpoint, no 2 sides with a common endpoint are collinear


no line that contains a side goes through the interior of the polygon

Equilateral polygon

all sides are congruent


all angles are congruent

Regular Polygon

both equilateral and equiangular