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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 and is represented by a shape that looks like a floor or wall.
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 one the same side of point A as point B.
Intersection The set of points two or more geometric figures have in common.
postulate/axiom A rule that is accepted without proof.
midpoint the point that divides a segment into two congruent segments.
segment bisector a point ray line ,line segment or plane that intersects a 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 in the point in the interior of the polygon.
polygon a closed plane figure formed by three or move line segments.
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 greater than 90 and less than 180.
straight angle an angle that has a measure of 180.
angle bisector a ray that divides an angle into two angles that are congruent.
complementary 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.
vertical angles two angles whose sides form two pairs of opposite rays.
undefined terms Words that do not have a formal definitions but there is agreement about what they mean.(point, line,plan)
collinear points points that lie on the same line.
coplanar points points that lie on the same plane.
defined terms terms that can be described using known words such as point or line.
segment consist of two endpoints and all the points between them.
opposite rays rays that start at the same point but go away from each other creating a straight line.
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 straightedge.
congruent segments line segments that have the same length.
between when three points are collinear ,one point is between the other two.
vertex of an angle the common endpoint of two rays.
angle a set of points consisting of two different rays that have the same endpoint.
sides of angle the rays of an angle.
interior of an angle the region that contains call the points between the sides of the angle.
exterior of an angle angles that form linear pairs with the interior angles of a polygon.
measure of an angle the absolute value of the difference between the real numbers matched with the two rays that form the angle on the protractor.
linear pair two adjacent angles whose noncommon sides are opposite rays.
 

 



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