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Geometry C1
Term | Definition |
---|---|
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 |