# Shared Flashcard Set

## Details

Geometry Terms, Triangles, Angles
Davis Intermediate
23
Mathematics
01/28/2011

Term
 A dot that represents a specific location in a plane or space. [image]
Definition
 Point
Term
 Infinite set of points that extend in opposite directions (2 points define a line). [image]
Definition
 Line
Term
 An initial point and all of the points in one direction (part of a line). [image]
Definition
 Ray
Term
 Formed by two rays with the same initial point. [image]
Definition
 Angle
Term
 Two endpoints and all of the points in between. [image]
Definition
 Line Segment
Term
 A flat surface that extends infinitely in all directions (3 points define a plane). [image]
Definition
 Plane
Term
 Two lines that are in the same plane and do not intersect. [image]
Definition
 Parallel Lines
Term
 Lines that cross each other at a point are called intersecting lines. [image]
Definition
 Intersecting Lines
Term
 Two lines that for 90° angles at their intersection.  [image]
Definition
 Perpendicular Lines
Term
 A straight line that follows the horizon (from left to right). [image]
Definition
 Horizontal Line
Term
 A straight line that is perpendicular to a horizontal line (up and down). [image]
Definition
 Vertical Line
Term
 Is the point at which 2 sides of an angle meet. [image]
Definition
 Vertex
Term
 Any angle that measures less than 90°. [image]
Definition
 Acute Angle
Term
 Any angle that measures between 90° and 180°.  [image]
Definition
 Obtuse Angle
Term
 Any angle that measures exactly 90°.    [image]
Definition
 Right Angle
Term
 Any angle that measures exactly 180°.  [image]
Definition
 Straight Angle
Term
 The total sum of the angles must equal 180°. [image]
Definition
 Triangle
Term
 All 3 angles are acute.  [image]
Definition
 Acute Triangle
Term
 Has 1 right angle and 2 acute angles [image]
Definition
 Right Triangle
Term
 Has 1 obtuse angle and 2 acute angles.  [image]
Definition
 Obtuse Triangle
Term
 All 3 sides different lengths. [image]
Definition
 Scalene Triangle
Term
 Has 2 sides of equal length. [image]
Definition
 Isosceles Triangle
Term
 All sides are equal. [image]
Definition
 Equilateral Triangle
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