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Acute Angle is less than 90 degress
Adjacent Angles Two angles that have a common side and a common vertex
Angle A figure that consists of two noncollinear rays with a common endpoint.
Angle Bisector A ray that divides an angle into two congruent angles
Collinear Points Points that lie on the same line.
Complementary angles Two angles whose sum of their measures is 90 degrees.
Congruent Angles Two angles that have the same measurement.
Coordinate In an ordered pair, the first component is called the x-coordinate and the second component is called the y-coordinate.
Coordinate Plane is a number plane formed by two perpendicular number lines that intersect at their zero points.
Coplanar Points Points that lie in the same plane.
Degree is one of the units of meaures used in measuring angles.
Distance The absolute value of the difference of the coordinate of two points on a number line represents the measure of the distance between two points.
Exterior Any point that is not on the angle or in the interior of the angle.
Intersection the set of points that are in both figures.
Line One of the basic undefined terms of geometry. They extend indefintely and have no thickness or width.
Linear Pair Two angles that are adjacent and their noncommon sides are opposite rays.
Midpoint A point between two points forming segments that are of equal measure.
Obtuse Angle An angle that is greater than 90 degrees.
Ordered Pair a pair of numbers which the order is specified. They are used to locate points in a plane.
Origin The point of intersection of the x-axis and y-axis in a coordinate plane and named O.
Perpendicular Lines Two lines that intersect to form a right angle.
Plane One of the basic undefined terms of geometry. They extend indefinetly in all directions and have no thickness.
Point One of the basic undefined terms of geometry. They have no dimension and are represented by dots, and are named by capital letters.
Postulate A statement that describes a fundamental property of the basic terms. They are accepted as being true.
Protractor A tool used to find the degree meaure of a given angle.
Compass An instrument used to draw circles and arcs of circles.
Quadrant One of the four regions into which two perpendicular number lines separate the plane into.
Ray A set of points that starts with an endpoint and goes on indefinitely in the other direction.
Right Angle An angle whose degree measure is 90.
Segment Part of line that consists of two points called endpoiints, and all the point between them.
Side The two rays that form the angle.
Space The set of all points.
Straight Angle An angle whose degree measure is 180.
Supplementary Angles Two angles whose sum of their degree measures is 180.
Theorem A theorem is a statement that must be proven before it is accepted as true
Undefined Term A word that has a measing that is readily understood. The basic ones in geometry are point, line and plane.
Vertex The common endpoint of the two rays that form the angle.
Vertical Angles Two angles that are two nonadjacent angles formed by intersecting lines.
X-Axis The horizontal number line in a coordinate plane.
X-coordinate The first component in an ordered pair.
Y-axis The vertical number line in a coordinate plane.
Y-coordinate The second component in an ordered pair.
Corollory A statement that can be easily proven using a theorem.
Created by: holdenmath