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Geometry Terms

Point No dimension, represents a precise location, symbolized with a dot and a capital letter.
Line One dimension (length). A straight path that extends infinitely in both directions. Two points determine a line.
Segment A part of a line between two endpoints. A finite length.
Plane A two dimensional (length and width) surface that extends infinitely in all directions. 3 non-collinear points determine a plane.
Collinear Three or more points on the same line. Co (together) Linear (line).
Non-Collinear Three or more points that are NOT on the same line. You know that 3 points are non collinear when you cannot draw one line that contains all three of those points.
Coplanar Points that lie on the same plane.
Compass Geometric tool used to draw a circle or part of a circle known as an arc.
Straightedge A tool used to draw straight lines.
Congruent Identical. Exactly the same shape and same size.
Distance The length of the segment between two points.
Intersection A point or set of points common to two or more geometric figures. The intersection of two lines is a point. The intersection of two planes is a line.
Linear Pair A pair of angles (two) that form a straight line. These are adjacent and add up to 180 degrees.
Adjacent Next to one another. Two angles are adjacent when they share a common vertex and a common side.
Vertex A common endpoint. The vertex of an angle is where the two sides of the angle converge or meet.
Midpoint The point exactly halfway between the endpoints of a segment.
Angle Two rays with a common vertex form an angle measured in degrees.
Acute Angle An angle that measures between 0 and 90 degrees.
Obtuse Angle An angle that measures between 90 and 180 degrees.
Straight Angle An angle that measures exactly 180 degrees.
Construction Mark A mark created using a compass. An arc is another name for a construction mark.
Radius Constant distance from the center of a circle to a point on the circle.
Right Angle An angle that measures exactly 90 degrees.
Supplementary Angles Two angles whose sum is 180 degrees.
Complementary Angles Two angles whose sum is 90 degrees.
Proof A logical argument in which each statement you make is supported by a reason that is accepted as true.
Parallel Lines Two lines that never intersect. There is always 180 degrees between them.
Perpendicular Forms a right angle.
Equilateral Having equal side lengths.
Equiangular Having equal angles.
Right Triangle A triangle that contains a right angle
Triangle 3 sided Polygon. Interior angles always sum to 180 degrees.
Isosceles Triangle Triangle with two congruent Legs and two congruent base angles.
Equilateral Triangle Triangle with 3 congruent sides and angles.
Corresponding parts Matching parts of congruent figures.
Pythagorean Theorem A group of three whole numbers that satisfies the equation a^2 + b^2 = c^2, where c is the greatest number.
Hypotenuse The largest side of a right triangle. This side is directly 0pposite the right angle.
Equidistant The same distance.
Perpendicular Bisector A line that is perpendicular (forms right angle) and passes through the midpoint of a segment. Any point on a perpendicular bisector is always equidistant from the two points in which is being bisected.
Bisector Cuts exactly into two congruent parts.
Angle Addition Part + Part = Whole. The Whole is the sum of its parts. Two adjacent angles that combine to form a larger angle.
Segment Addition Part + Part = Whole. The Whole is the sum of its parts. Two segments that combine to form a larger segment.
Created by: mrkamen
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