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35 Cards in this Set
- Front
- Back
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parallel lines
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lines in the same plane that never cross or intersect
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acute angle
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angle that is less than 90 degrees
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line
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set of points that make a straight path
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point
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an exact location in space
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intersecting lines
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two lines that cross paths
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protractor
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tool used for measuring angles
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right angle
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an angle that measures 90 degrees
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degrees
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unit used for measuring angles
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perpendicular lines
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lines which intersect to form right angles (90 degrees)
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infinity
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never-ending
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angle
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two rays with a common endpoint
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ray
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part of a line with only one end-point; goes only in one direction
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vertex
vertices (more than one vertex) |
point where two rays meet
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obtuse angle
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angle that is greater than 90 degrees
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line segment
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part of a line with two endpoints
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ruler
straightedge |
tool used to measure lines
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straight line
straight angle |
line or angle that measures 180 degrees
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horizontal axis
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line that goes across a coordinate plane
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vertical axis
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line that goes up and down on a coordinate plane
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polygon
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closed plane figure
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hexagon
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six-sided polygon
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pentagon
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five-sided polygon
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quadrilateral
rectangle |
four-sided polygon
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triangle
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three-sided polygon
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circle
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has no edges or vertices
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cone
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has one face, one edge, and one vertex
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perimeter
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sum of all the sides of a polygon
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area
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number of square units in a polygon
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rotation
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a figure that moves around a point
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translation
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when a figure moves across a line; it does not change, it just moves to a different place
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reflection
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when a figure flips or turns across a line
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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 |
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line of symmetry
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the fold line of two exact parts
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congruent
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figures that are same size, same shape
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similiar
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two plane figures that are same shape, but different size
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