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### 27 Cards in this Set

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• Back
 An angle that has a measure less than a right angle (less than 90 degrees) Acute Angle A figure formed by two line segments or rays that share the same endpoint Angle The bottom of a figure Base The amount a container can hold when filled Capacity A figure with no open spaces in its sides Closed Figure Having the same size and shape Congruent A polygon that is a flat surface of a solid figure Face A movement of a figure to a new position by flipping the figure over a line. Flip Lines that cross each other at exactly one point Intersection A straight line going on forever in opposite directions Line A part of a line that includes two points, called endpoints, and all the points between them. Line Segment An angle that has a measure greater than a right angle Obtuse Lines that never intersect and are always the same distance apart Parallel lines Two lines that intersect to form four right angles Perpendicular An exact location in space Point A part of a line that has a beginning but no end. Ray A flip Reflection An angle that forms a square cornger and has a measure of 90 degrees. Right A movement of a figure to a new position by rotating the figure around a point. Rotation The movement of a figure by a slide, flip, or turn Translation A movement of a figure to a new position without turning or flipping it.` Slide The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three or more edges of a solid figure; the top point of a cone; the plural of vertex is vertices. Vertex A flat surface that extends without end in all directions. Plane A figure in a plane that is formend by lines that are curved, straight, or both. Plane Figure A closed plane figure whose sides are straight lines that are connected end-point to end-point. Polygon Having the same shape and the same of different size similar polygons A polyon that has sides that are the same length Regular Polygon