# Shared Flashcard Set

## Details

Geometry Chapter 1
Davisha Risher
36
Mathematics
10/18/2012

## Additional Mathematics Flashcards

Term
 Point :
Definition
 A point specifies only location; it has no length, width, or depth. We usually represent a point with a dot on paper, but the dot we make has some dimension, while a true point has dimension [image]
Term
 Line :
Definition
 A line has only one dimension: length. It continues forever in two directions (so it has infinite length), but it has no width at all. A line connects two points via the shortest path, and then continues on in both directions.
Term
 Segment
Definition
 A line segment is the portion of a line lying strictly between two points. It has a finite length and no width.
Term
 Ray
Definition
 ray can be thought of as a half a line. It has a point on one end, and it extends infinitely in the other direction.
Term
 Plane
Definition
 A plane is a flat, two-dimensional object. We often represent a plane by a piece of paper, a blackboard, or the top of a desk. In fact, none of these is actually a plane, because a plane must continue infinitely in all directions and have no thickness at all. A plane can be defined by two intersecting lines or by three non-collinear points. [image] [image]
Term
 Collinear
Definition
 Three or more points that lie on the same straight line are called to be Collinear.       [image]
Term
 Coplanor
Definition
 wo objects are coplanar if they both lie in the same plane. In the figure above, the two rectangles ABCD and PQRS are both coplanar. [image]
Term
 Angle
Definition
 Angles are formed by two rays that begin at the same point or share the same endpoint.  [image]
Term
 Midpoint
Definition
 Midpoint of a line segment is the point that is halfway between the endpoints of the line segment. [image]
Term
 Biscetor
Definition
 Angle Bisector is a ray that divides an angle into two equal parts. [image]
Term
 Congruent
Definition
 Two figures are congruent if all corresponding lengths are the same, and if all corresponding angles have the same measure. Colloquially, we say they "are the same size and shape," though they may have different orientation. (One might be rotated or flipped compared to the other.) [image]
Term
 Vertex
Definition

[image]

 close window A vertex is the point where two sides of a polygon meet.
Term
 Acute angles
Definition
 The measure of an angle with a measure between 0° and 90° or with less than 90° radians. [image]
Term
 Obtuse Angle
Definition
 Angle measures greater than 90 degrees but less than 180 degrees. [image]
Term
 Right Angle
Definition
 A right angle measures exactly 90 degrees. (Remember the uppercase letter L which will help you remember the angle of a right angle) [image]
Term
 Straight Angle
Definition
 Straight Angles measure exactly 180 degrees [image]
Term
 Complementary Angles
Definition
[image]
 The two angles involved when the sum is 90°.
Term
 Supplementary angles
Definition
 Two Angles are Supplementary if they add up to 180 degrees.They don't have to be together to be supplementary, just so long as the total is 180 degrees. [image]
Term
 Verticle angles
Definition
 Vertical Angles are the angles opposite each other when two lines cross. [image]
Term
Definition
 Either of two angles having a common side and a common vertex. [image]
Term
 Linear pair
Definition
 Linear Pair is a pair of adjacent angles that form a straight line. [image]
Term
 Polygon
Definition
 Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up). [image]
Term
Definition
 A quadrilateral is a 2-dimensional closed shape with four straight sides.  E.g. The shape ABCD shown here is a quadrilatera [image]
Term
 Pectagon
Definition
 Pentagon is a polygon with five sides [image]
Term
 Hexagon
Definition
 a hexagon is a polygon with six edges and six vertices.  [image]
Term
 Octagon
Definition
 A polygon with eight sides is called an octagon [image]
Term
 Dectagon
Definition
 Decagon is a polygon with 10 sides and equal number of angles. [image]
Term
 Dodecagon
Definition
 A 12-sided polygon (a flat shape with straight sides). [image]
Term
 n-gon
Definition
 A polygon with n sides. For example, an 8-gon is another name for an octagon.
Term
 Concave
Definition
 polygon with one or more interior angles greater than 180°. It looks sort of like a vertex has been 'pushed in' towards the inside of the polygon. [image]
Term
 Convex
Definition
Term
 irregular
Definition
 A polygon whose sides are not all the same length or whose interior angles do not all have the same measure.     [image]
Term
 regular
Definition
 olygon that has all sides equal and all interior angles equal [image]
Term
 Diagonal
Definition
 Diagonal is a line segment connecting two non-adjacent vertices of a polygon. [image]
Term
 side
Definition
 A side of a polygon is a line segment connecting any two vertices of the polygon. edge [image]
Term
 Perimeter
Definition
 he distance around a two-dimensional shape. [image]
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