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20 Cards in this Set
 Front
 Back
when figures are the same size and shape

congruent figures


an angle with a 90 degree square corner

right angle


the distance across a circle through its center

diameter


an angle smaller than a right angle

acute angle


an angle larger than a right angle

obtuse angle


a figure that is formed when two lines, or rays, meet

angle


the distance from the center of a circle to any point on the circle

radius


when halves of a shape or design match or are congruent

symmetry


a motion in which a figure moves in one direction

slide (translation)


a pair of numbers or letters that names a point on a grid

ordered pair


a move that makes a figure face in the opposite directions

flip (reflection)


rotating a figure around a point

turn (rotation)


a straight path that extends in both directions

line


a part of a line and has two end points

line segment


a part of a line and has one endpoint

ray


You can form an angle by drawing two rays that meet at the same endpoint. The point is called a...

vertex


a closed figure made of line segments

polygon


a polygon with 4 sides and 4 vertices

quadrilateral


a quadrilateral made of parallel lines on opposite sides

parallelogram


has 4 sides and 4 vertices, but only one pair of sides is parallel

trapezoid
