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Chapter 1 Vocab
n/a
34
Mathematics
9th Grade
10/05/2010

Additional Mathematics Flashcards

 


 

Cards

Term
Point
Definition
A location
Term
Line
Definition

 

  • Straight 
  • Infinite 
  • Made up of infinite # of points.

 

Term
Collinear
Definition
Points that are on the same line.
Term
Plane
Definition
A flat surface which extends infinitely in all directions.
Term
Coplanar
Definition
Points on the same plane.
Term
Line Segment
Definition

  • Finite 
  • Has 2 endpoints

Term
Precision
Definition

  • How accurate the answer is.
  • Half of the smallest unit of measurement.

Term
Space
Definition

The boundless 3-D set of all points.

 

Term
Congruent Segments
Definition
Two segments with the same length.
Term
Distance Between 2 Points
Definition

Number Line

|b-a|

Coordinate Plane

D=√(x1 - x2)2 + (y2 - y1)2

Term
Midpoint
Definition

Number Line

a + b

   2

Coordinate Plane

(x1 + x2    y1 + y2 )

     2      ,     2

Term
Segment Bisector
Definition
A line or ray which divides a line segment into two equal parts.
Term
Ray
Definition

  • Infinite in one direction
  • One endpoint
  • No midpoint

Term
Opposite Rays
Definition

  • Same starting point
  • Opposite directions
  • Form a line

Term
Angle
Definition
Figure formed by 2 non-collinear rays that have a common endpoint.
Term
Angle Sides
Definition
Rays
Term
Angle Vertex
Definition
Common endpoint of the rays.
Term
Right Angle
Definition
Measures 90°
Term
Acute Angle
Definition
Measures less than 90°
Term
Obtuse Angles
Definition
More than 90° and less than 180°
Term
Congruent Angles
Definition
Angles with the same measure.
Term
Angle Bisector
Definition
A ray that divides an angle into 2 equal parts.
Term
Adjacent Angles
Definition

  • share a common side
  • share a vertex
  • they don’t overlap, they’re just next to each other.

Term
Vertical Angles
Definition

  • two non-adjacent angles 
  • formed by intersecting lines

Term
Linear Pair
Definition

  • adjacent angles whose non-common sides are opposite rays. (form a line)
  • like supplementary angles

Term
Complementary Angles
Definition

  • two angles whose measures add up to 90°

Term
Supplementary Angles
Definition
  • two angles whose measures add up to 180°
  • difference between linear pair and supplementary angles: linear pairs don’t have to be adjacent.
Term
Perpendicular Lines
Definition

  • two lines that intersect to form right angles.

Term
Polygon
Definition

  • a closed figure
  • made up of segments that intersect at their endpoints
  • named by letters of the vertices in order.

Term
Concave Polygon
Definition

  • caves in (a vertex is inside the polygon)

Term
Convex Polygon
Definition

  • regular polygon (vertex doesn’t cave in)

Term
Dodecagon
Definition

  • 12-sided polygon

Term
Regular Polygon
Definition

  • all sides & all angles are congruent.
  • square, equilateral triangle, etc.
  • must be convex

Term
Perimeter
Definition

  • The sum of the measures of all the sides.

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