A location in space (no width, depth, etc.) - Point , A piece of a line contained by two points - Line Segment, Same size, same shape. - Congruent, A one-dimensional figure that is straight, has indefinite length in two directions, and no thickness - Line, All points on a line that are on one side of a fixed point including the fixed point - Ray, Two intersecting lines or line segments within a plane that form a right angle - Perpendicular, Two lines on the same plane that will never intersect - Parallel, A flat two-dimensional surface that extends infinitely in all directions; it has no thickness and is defined by three non-collinear points. - Plane, Two or more points on the same line - Collinear, Two or more points, lines, segments or rays on the same plane - Coplanar, Two rays that share a common endpoint - Angle, The common endpoint where two rays meet to form an angle - Vertex, Ray dividing the measure of an angle into two equal/congruent angles - Angle Bisector, Point, line, segment or ray that divides the measure of a segment into two equal/congruent parts - Segment Bisector, Point on a line segment that divides the segment into two equal/congruent parts - Midpoint, Formula used with right triangles to find the missing leg or hypotenuse - Pythagorean Theorem, The two sides of a right triangle that meet to form a right angle - Leg, The side of a right triangle that is across from/opposite from the right angle; it is also the longest side of a right triangle - Hypotenuse, An angle between zero and ninety degrees - Acute, The side across from a given angle - Opposite, The side next to a given angle; beside or next to - Adjacent, Occurs when a figure can be divided into two identical halves by a line, and one half is a mirror image of the other - Reflectional (Line) Symmetry, Exists in a shape when it looks the same after being rotated by a certain angle (less than 360 degrees) around a central point - Rotational Symmetry, Moves every point of a figure the same distance and the same direction (a “slide” along the coordinate plane) - Translation, Turns a figure around a fixed point called the center of rotation (a “turn” on the coordinate plane) - Rotation, Flips a figure over a line known as the line of reflection (a “flip” on the coordinate plane) - Reflection, The size of a figure is changed (either expanding or shrinking it) without changing the figures shape - Dilation, Transformations where the size and shape of a figure does not change (i.e. translations, rotations and reflections) - Rigid Motion Transformations, Something that runs flat, parallel to the horizon, extending from left to right or right to left, and has a slope of zero. - Horizontal, An up-and-down line, characterized by having an undefined slope and an equation of the form x = a, where all points on the line share the same x-coordinate. - Vertical, A specific point that marks the end of a geometric object, such as a line segment or a ray - Endpoint, A right angle, which is an angle of exactly 90 degrees - Right, The measurement of the space between two points - Distance,

Unit 1 Geometry Basics

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