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15 Cards in this Set
- Front
- Back
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Vertex
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the point at which two rays of an angle, two sides of a polygon, or three or more edges of a solid meet
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Ray
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a part of a line that has one endpoint and extends on and on in only one direction
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Angle
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formed by two rays with the smae endpoint
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right angle
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an angle with a measurement of 90 degrees
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obtuse angle
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an angle with a measurement of more than 90 degrees but less than 180 degrees
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Parrallel lines
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lines in a plane that stay exactly the same distance apart
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Perpendicular lines
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two lines that intersect to form right angles
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Intersecting lines
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lines that cross but do not form right angles
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translation
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a motion in which each point of a geometric figure or shape is moved in the same direction and by the same distance; a slide
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rotation
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a motion in which a geometric figure or picture is turned about a fixed point; a turn similar to the movement of the hands of a clock
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reflection
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a motion in which a geometric figure or picture flips to face itself across a line of symmetry; a flip
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congruent shapes
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figures that have the same size and shape; can be verified with translations, rotations, and reflections
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line of symmetry
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a line on which a figure can be folded so that the two halves of the figure are congruent; figures can have more than one line of syymetry; can be verified with a reflection
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polygon
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a closed, two dimensional figure formed by three or more line segments joined at endpoints, has straight sides
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face
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a flat surface of a three dimentsional figure in the shape of a polygon
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