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35 Cards in this Set
 Front
 Back
parallel lines

lines in the same plane that never cross or intersect


acute angle

angle that is less than 90 degrees


line

set of points that make a straight path


point

an exact location in space


intersecting lines

two lines that cross paths


protractor

tool used for measuring angles


right angle

an angle that measures 90 degrees


degrees

unit used for measuring angles


perpendicular lines

lines which intersect to form right angles (90 degrees)


infinity

neverending


angle

two rays with a common endpoint


ray

part of a line with only one endpoint; goes only in one direction


vertex
vertices (more than one vertex) 
point where two rays meet


obtuse angle

angle that is greater than 90 degrees


line segment

part of a line with two endpoints


ruler
straightedge 
tool used to measure lines


straight line
straight angle 
line or angle that measures 180 degrees


horizontal axis

line that goes across a coordinate plane


vertical axis

line that goes up and down on a coordinate plane


polygon

closed plane figure


hexagon

sixsided polygon


pentagon

fivesided polygon


quadrilateral
rectangle 
foursided polygon


triangle

threesided polygon


circle

has no edges or vertices


cone

has one face, one edge, and one vertex


perimeter

sum of all the sides of a polygon


area

number of square units in a polygon


rotation

a figure that moves around a point


translation

when a figure moves across a line; it does not change, it just moves to a different place


reflection

when a figure flips or turns across a line


symmetry
symmetrical 
when a figure can be folded to be exactly the same on both sides
when two parts are exactly the same, they are symmetrical 

line of symmetry

the fold line of two exact parts


congruent

figures that are same size, same shape


similiar

two plane figures that are same shape, but different size
