MATH VOCAB STUDY Flashcards
Undefined Terms
Words that do not have formal definitions, but there is an agreement about what they mean.
Line
A line has one dimension. It is represented by a line with two arrowheads, but it extends without end.
Point
A location in space that is represented by a dot and has no dimension.
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.
Collinear Points
Points that lie on the same line.
Coplanar Points
Points that lie in the same plane.
Defined Terms
Terms that can be described using known words such as point or line.
Line Segment
Consists of two endpoints and all the points between them.
Endpoints
Points that represent the ends of a line segment or ray.
Ray
Ray AB is a ray if it consists of the endpoint A and all the points on Line AB that lie on the same side of A as B.
Opposite Rays
If point C lies on Line AB between A and B, then Ray CA and Ray CB are opposite rays.
Intersection
The set of points two or more geometric figures have in common.
Postulate
A rule that is accepted without proof.
Axiom
A rule that is accepted without proof.
Coordinate
A real number that corresponds to a point on a line.
Distance
The absolute value of the difference of two coordinates on a line.
Construction
A geometric drawing that uses a limited set of tools, usually a compass and a straightedge.
Congruent Segments
Line segments that have the same length.
Between
When three points are collinear, one points Is between the other two.
Midpoint
The point that divides a segment into two congruent segments.
Segment Bisector
A point, ray, line, line segment, or plane that intersects the segment at its midpoint.
Inscribed Polygon
A polygon in which all of the vertices lie on a circle.
Circumscribed Circle
A circle that contains all the vertices of an inscribed polygon.
Angle
A set of points consisting of two different rays that have the same endpoint.
Vertex
The point where a graph changes direction.
Sides of an angle
The rays of an angle.
Interior of an angle
The region that contains all the points between the sides of an angle.
Exterior of an angle
The region that contains all the points outside of an angle.
Measure of an angle
The absolute value of the difference between the real numbers matched with the two rays that form the angle on a protractor.
Acute Angle
An angle that has a measure greater than 0 degrees and less than 90 degrees.
Right Angle
An angle that has a measure of 90 degrees.
Obtuse Angle
An angle that has a measure greater than 90 degrees and less than 180 degrees.
Straight Angle
An angle that has a measure of 180 degrees.
Congruent Angles
Two angles that have the same measure.
Angle Bisector
A ray the divides an angle into two angles that are congruent.
Complementary Angles
Two angles whose measures have a sum of 90 degrees.
Supplementary Angles
Two angles whose measures have a sum of 180 degrees.
Adjacent Angles
Two angles that share a common vertex and side, but have no common interior points.
Linear Pair
Two adjacent angles whose noncommon sides are opposite rays.
Vertical Angles
Two angles whose sides form two pairs of opposite rays.
Reflex Angle
An angle that has a measure greater than 180 degrees but less than 360 degrees.
Compass
A tool used to inscribe shapes and angles.
Protractor
A tool used for measuring angles.
