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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 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