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24 Cards in this Set
- Front
- Back
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Perpendicular Lines
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Intersect to form a 90° angle, or a right angle.
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Parallel Lines
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Lines in a plane that never intersect-the distance between them is always the same.
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Horizontal Lines
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A line that goes from left to right.
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Intersecting Lines
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Lines that have one and only one point in common.
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Angle
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An angle is formed when two rays intersect.
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Acute Angles
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An angle less than 90 degrees but more than 0 degrees.
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Obtuse Angles
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An angle between 90 and 180 degrees.
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Right Angle
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The 90 degree angle between two perpendicular lines
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Straight Angle
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An angle of 180 degrees
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Degree
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The basic unit by which angles are measured
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Protractor
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Drafting instrument used to draw or measure angles
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Ray
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A line with one endpoint.
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Vertex of an Angle
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The intersection of the the two sides of an angle.
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Sides of an Angles
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The two rays that form an angle.
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Adjacent Angles
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Have a common side.
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Congruent
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Two angles having the same measure.
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Interior Point
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In mathematics, the interior of a set S consists of all points of S that are intuitively "not on the edge of S". A point that is in the interior of S is an interior point of S.
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Transversal
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A straight line that intersects parallel lines.
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Complementary Angles
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Two angles whose measures have a sum of 90°.
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Supplementary Angles
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Two angles whose measure have a sum of 180°.
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Vertical Angles
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Two lines intersecting, two pairs of opposite angles are formed (congruent)
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Corresponding Angles
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Corresponding angles are on the same side of the transversal. Both angles are either above the parallel lines or below them. (congruent)
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Alternate Interior Angles
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Alternate Exterior Angles
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