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Conic section wikipedia , lookup
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Basic Definitions Geometry Point Represented by a dot Location only, has no dimension Most basic form of geometry Line Straight Consists of an infinite number of points Need 2 points to define a line Has no end points (goes on forever in both directions) Endpoint A point on a line that signifies the line stops at that point Ray A piece of a line Has one end point and extends forever in only one direction Line Segment A smaller piece of a line Has 2 endpoints Only type of line you can measure for distance Length The measure of distance between two points Midpoint Exactly half way between to points Usually only used for line segments Parallel Lines Two or more distinct lines that never intersect Always stay the same distance apart Perpendicular lines Two lines that intersect a right angle Right angle = 90° Vertex The point at which two lines intersect The “pointy” part of an angle Collinear 2 or more points that are on the same line 2 points that are not on the same line: non-collinear Plane A flat, 2-dimensional surface Need 3 points or 2 intersection lines to define Examples: your paper, the whiteboard, the floor Coplanar Points or lines that lie in the same plane If they don’t: non-coplanar Space Any 3-dimensional area Examples: This room, the world, the universe Skew Lines 2 lines that do not intersect, however are going in different directions What are 2 lines that do not intersect that are going in the same direction?