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Chapter 1 Vocabulary

Big Ideas Geometry Chapter 1 Vocabulary

TermDefinition
acute angle An angle that has a measure greater than 0° and less than 90°
adjacent angles Two angles that share a common vertex and side, but have no common interior points
angle bisector A ray that divides an angle into two angles that are congruent
angle A set of points consisting of two different rays that have the same endpoint
complementary angles Two angles whose measures have a sum of 90°
collinear points Points that lie on the same line
congruent angles Two angles that have the same measure
congruent segments Line segments that have the same length
coplanar points Points that lie in the same plane
endpoints Points that represent the ends of a line segment or ray
line has one dimension. It is represented by a line with two arrowheads, but it extends without end.
line segment A part of a line that consists of two endpoints.
linear pair Two adjacent angles that create a straight line.
midpoint The point that divides a segment into two congruent segments
obtuse angle An angle that has a measure greater than 90° and less than 180°
opposite rays Two rays that have the same endpoint and form a line
point A location in space that is represented by a dot and has no dimension
right angle An angle that has a measure of 90°
plane 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
ray A part of a line that consists of an endpoint and all points on the line on one side of the endpoint
segment A part of a line that consists of two endpoints
segment bisector A point, ray, line, line segment, or plane that intersects the segment at its midpoint
supplementary angles Two angles whose measures have a sum of 180°
vertex of an angle The common endpoint of the two rays that form an angle
weighted average The average of two points on a number line that are weighted unequally
straight angle An angle that has a measure of 180°
vertical angles Two angles whose sides form two pairs of opposite rays
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