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Geometry C1

TermDefinition
point A location in space that is represented by a dot and has no dimension.
line One-dimensional geometric figure that extends in two opposite directions without end.
plane A flat surface made up of points, that has two dimensions and extends without end; is represented by a shape that looks like a floor or wall.
collinear points Points that lie on the same line.
coplanar points Points that lie in the same plane.
line segment Consists of two endpoints and all points between them.
endpoints Points that represent the ends of a line segment or ray.
ray A geometric figure that consists of the endpoint A and all points on line AB that lie on the same side of point as point B.
opposite rays If point C lies on line AB between A and B, then ray CA and ray CB are opposite.
intersection The set of points that 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.
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.
convex polygon A polygon in which no line that contains a side of the polygon contains a point in the interior of the polygon.
concave polygon A polygon in which at least one line that contains a side of the polygon contains a point in the interior of the polygon.
polygon A closed plane figure formed by three or more line segments.
side Line segments that form polygons.
vertex Intersection of line segments that form geometric figures.
angle A set of points consisting of two different rays that have the same endpoint.
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 and less than 90.
right angle An angle that has a measure of 90.
obtuse angle An angle that has a measure greater than 90 and less than 180.
straight angle An angle that has a measure of 180.
congruent angles Two angles that have the same measure.
angle bisector A ray that divides an angle into angles that are congruent.
protractor A tool that helps you approximate the measure of an angle.
degrees A unit of measurement of angles.
complementary angles Two angles whose measures have a sum of 90.
supplementary angles Two angles whose measures have a sum of 180.
adjacent angles Two angles that share a common vertex and side, but have no common interior points.
linear pair Two adjacent angles whose non-common sides are opposite rays.
vertical angles Two angles whose sides form two pairs of opposite rays.
converse The statement formed by exchanging the hypothesis and conclusion of a conditional statement
congruent same size, same shape
distance from a point to a line The length of the perpendicular segment from the point to the line
perpendicular bisector A line that is perpendicular to a segment at its midpoint
slope rate of change between any two points on a line
slope-intercept form a linear equation written in the form y=mx+b where m=slope and b=y-intercept
y-intercept the y-coordinate of a point where the graph crosses the y-axis
Created by: Patience Farmer
 

 



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