Geometry 1.1-1.6

vocab for the units that we have done in class

Point

a figure that has no dimension, represented by a dot

Plane

a two dimensional figure that extends without end, represented by a shape that looks like a floor or wall

Collinear

points that are on the same line

Coplanar

points that lie in the same plane

Segment

all points between two endpoints

Postulate

a rule that is accepted without proof

Theorem

a rule that can be proved

Coordinate

The real number that corresponds to a point on the ruler

Distance

the distance between two points is the absolute value of the difference of the coordinates A & B

Congruent Segments

segments that have the same length

Tick marks

indicate congruent segments

Segment Addition Postulate

if B is between A & C then AB +BC=AC

Midpoint

point that divides segment into two congruent segments

Bisect

to cut into two equal parts

Segment bisector

Point, Ray, line, segment, or plane that intersects the segment at its mid- point

polygon

closed plane figure, formed by three or more line segments

sides

line segments that make up a polygon

vertex

intersection

Angle

set of points consisting of two different rays that have the same endpoint

acute

greater than zero, less than 90

right angle

measures exactly 90

measures greater than 90, less than 180

obtuse

measures exactly 180

straight angle

angle bisector

ray that divides an angle into two angles that are congruent

Complementary angles

angles that measure to 90

Supplementary angles

angles that measure to 180

adjacent angles

two angles that share a common vertex and side, but have no common interior points

linear pair

two angles are a linear pair when noncommon sides are opposite rays

vertical angles

two angles are vertical angles when their sides form opposite rays