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20 Cards in this Set
- Front
- Back
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Congruency
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Geometric figures having the same size and shape; all corresponding parts of congruent figures have the same measure.
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Perpendicular
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Lines in the same plane which intersect to form a right angle.
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Parallel
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Lines that lie in the same plane and never meet. Also, planes lying in space that never meet.
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Similarity
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Two or more figures having the same shape but not necessarily the same size.
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Symmetry
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A figure has symmetry if there exists some line or point through which all points of the figure can be reflected to generate another point on the figure.
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Three-dimensional
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An object that has length, width, and height.
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Two-dimensional
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A figure that has length and width but not height (i.e., a plane figure such as a rectangle or circle)
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Vertex (vertices)
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The points where two line segments come together (corners).
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vertical angles
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When two lines intersect, they make four angles at the vertex. The angles opposite each other are equal in size and are called vertically opposite angles.
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complementary angles
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Two angles for which the sum of their measures is 90°.
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straight angle
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An angle which measures 180°.
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supplementary angles
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Two angles for which the sum of their measures is 180°.
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straightedge
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An object that can be used to draw straight lines.
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adjacent angles
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Two angles positioned in the same plane that have a common side and a common vertex.
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acute angle
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A sharply pointed angle with size less than a right angle (<90°).
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protractor
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An instrument used to measure and draw angles.
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obtuse angle
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An angle that measures more than a right angle (greater than 90°) but smaller than a straight angle (180°).
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compass
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An instrument used to draw a circle and to mark off equal lengths.
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angle
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The space between two straight lines with a common endpoint or vertex.
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right angle
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An angle measuring exactly 90°.
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