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Basics of Geometry

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Term
Definition
A single location in space with no length, width, or height (zero dimensional).   Point  
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A collection of connected points that has no thickness and extends forever in two opposite directions.   Line  
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A collection of points along a line that has a starting point and extends forever in only one direction.   Ray  
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A collection of points along a line that has a starting point and an ending point.   Line Segment  
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A geometric object formed by two rays with a shared starting point.   Angle  
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A point where two lines or rays meet.   Vertex  
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An angle that measures exactly 90 degrees.   Right Angle  
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An angle that measures between 0 and 90 degrees.   Acute Angle  
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Measures between 90 and 180 degrees.   Obtuse Angle  
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Measures exactly 180 degrees.   Straight Angle  
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Angle measures add to 360 degrees.   Angles around a point.  
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Share a common ray. (“Side by side” or “next to”).   Adjacent Angles  
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Two angles whose measures add to 90 degrees.   Complementary Angles  
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Two angles whose measures add to 180 degrees.   Supplementary Angles  
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Opposite angles formed by intersecting lines. These angles have equal measurements.   Vertical Angles  
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Bisects a segment into two congruent segments.   Midpoint  
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A line, ray, or segment that passes through the midpoint of a segment forming right angles.   Perpendicular Bisector  
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