Basic Geometry Definitions

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Geometry & Trigonometry

9th

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23 Terms

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Collinear
two or more points that lie on the same line
two or more points that lie on the same line
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line segment
a subset of a line consisting of two endpoints, and all and points between them
a subset of a line consisting of two endpoints, and all and points between them
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midpoint of a segment
a point on a line segment that divides it into two equal lengths
a point on a line segment that divides it into two equal lengths
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segment bisector
a line that intersects a line segment at its midpoint
a line that intersects a line segment at its midpoint
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ray
a subset of a line consisting of one endpoint and all points to one side
a subset of a line consisting of one endpoint and all points to one side
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opposite rays
two rays with a common endpoint that point in opposite directions to form a line
two rays with a common endpoint that point in opposite directions to form a line
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angle
two rays with a common endpoint
two rays with a common endpoint
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vertex
the common endpoint of two rays
the common endpoint of two rays
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interior of an angle
all points lying between two rays in an angle
all points lying between two rays in an angle
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adjacent angles
two angles sharing a common vertex and a common ray between them
two angles sharing a common vertex and a common ray between them
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linear pair
adjacent angles whose non-common rays form opposite rays
adjacent angles whose non-common rays form opposite rays
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vertical angles
a pair of non-adjacent angles formed by the intersection of two lines
a pair of non-adjacent angles formed by the intersection of two lines
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angle bisector
a line that divides an angle into two angles of equal measure
a line that divides an angle into two angles of equal measure
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acute angle
an angle whose measure is greater than 0° and less than 90°
an angle whose measure is greater than 0° and less than 90°
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obtuse angle
an angle whose measure is greater than 90° and less than 180°
an angle whose measure is greater than 90° and less than 180°
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right angle
an angle whose measure is 90°
an angle whose measure is 90°
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reflex angle
an angle whose measure is greater than 180°
an angle whose measure is greater than 180°
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straight angle
an angle whose measure is 180°
an angle whose measure is 180°
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complementary angles
two angles whose measures sum to 90°
two angles whose measures sum to 90°
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supplementary angles
two angles whose measures sum to 180°
two angles whose measures sum to 180°
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perpendicular lines
two lines that intersect to form angles that measure 90°
two lines that intersect to form angles that measure 90°
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perpendicular bisector
a line that intersects a line segment at its midpoint and is perpendicular to the line segment
a line that intersects a line segment at its midpoint and is perpendicular to the line segment
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congruent
two objects with equal lengths and/or equal angle measures
two objects with equal lengths and/or equal angle measures