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35 Cards in this Set

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  • 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
never-ending
angle
two rays with a common endpoint
ray
part of a line with only one end-point; 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
six-sided polygon
pentagon
five-sided polygon
quadrilateral
rectangle
four-sided polygon
triangle
three-sided 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