Big Ideas Math Geometry Chapter 1 Vocabulary – Flashcards
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Two angles that share a common vertex and side, but have no common interior points
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adjacent angle
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An angle that has a measure greater than 0⁰ and less than 90⁰
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acute angle
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A ray that divides an angle into two angles that are congruent
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angle bisector
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A set of points consisting of two different rays that have the same endpoint
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angle
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A rule that is accepted without proof
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axiom
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When three points are collinear, one point is between the other two.
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between
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Two angles whose measures have a sum of 90⁰
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complementary angles
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points that lie on the same line
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collinear
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line segments that have the same length
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congruent segments
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two angles that have the same measure
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congruent angles
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a real number that corresponds to a point on a line
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coordinate
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A geometric drawing that uses a limited set of tools, usually a compass and a straightedge
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construction
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Terms that can be described using known words, such as point or line
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defined terms
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points that lie in the same plane
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coplanar points
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Points that represent the ends of a line segment or ray
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endpoints
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The absolute value of the difference of two coordinates on a line
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distance
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the region that contains all the points outside of an angle
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exterior of an angle
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the region that contains all the points between the sides of an angle
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interior of an angle
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the set of points two or more geometric figures have in common
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intersection
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a line has one dimension. It is represented by a line with two arrowheads, but it extends without end.
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line
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consists of two endpoints and all the points between them
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line segment
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two adjacent angles whose noncommon sides are opposite rays
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linear pair
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the absolute value of the difference between the real numbers matched with the two rays that form the angle on a protractor
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measure of an angle
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the point that divides a segment into to congruent segments
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midpoint
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If point C lies on line AB between A and B, then ray CA and ray CB are opposite rays.
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opposite rays
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An angle that has a measure greater than 90° and less than 180°
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obtuse angle
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A location in space that is represented by a dot and has no dimension
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point
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A flat surface made up of points that has two dimensions and extends without end, and is represented by a shape that looks like a floor or a wall
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plane
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AB is a ray if it consists of the endpoint A and all points on line AB that lie on the same side of A as B.
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ray
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A rule that is accepted without proof
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postulate
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Consists of two endpoints and all the points between them
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segment
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An angle that has a measure of 90°
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right angle
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The rays of an angle
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sides of an angle
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A point, ray, line, line segment, or plane that intersects the segment at its midpoint
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segment bisector
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Two angles whose measures have a sum of 180°
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supplementary angles
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An angle that has a measure of 180°
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straight angle
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The common endpoint of the two rays that form an angle
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vertex of an angle
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Words that do not have formal definitions, but there is agreement about what they mean
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undefined terms
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Two angles whose sides form two pairs of opposite rays
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vertical angles
