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Geometry Vocabulary
NA
39
Mathematics
7th Grade
01/31/2012
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Term
Point
 Definition
An exact location
Term
Plane
 Definition
A flat surface that goes on forever
Term
Line
 Definition
A straight path that extends forever in opposite directions
Term
Line Segment
 Definition
Part of a line with two end points
Term
Ray
 Definition
Has one end point and then goes on without end in one direction
Term
Parallel Lines
 Definition
Lines that never cross and have no common points
Term
Perpendicular Lines
 Definition
Lines that cross at a right angle
Term
Angle
 Definition
Two rays with the same end point
Term
Vertex
 Definition
Where the two rays of an angle meet.
Term
Acute Angle
 Definition
An angle less than 90 degrees
Term
Obtuse Angle
 Definition
An angle larger than 90 degrees
Term
Right Angle
 Definition
An angle that is exactly 90 degrees
Term
Straight Angle
 Definition
An angle that is 180 degrees or 0 degrees
Term
Polygon
 Definition
Closed figure with no curves or intersecting lines
Term
Triangle
 Definition
A polygon with 3 sides
Term
Quadrilateral
 Definition
A polygon with 4 sides
Term
Pentagon
 Definition
A polygon with 5 sides
Term
Hexagon
 Definition
A polygon with 6 sides
Term
Heptagon
 Definition
A polygon with 7 sides
Term
Octagon
 Definition
A polygon with 8 sides
Term
Nonogon
 Definition
A polygon with 9 sides
Term
Decagon
 Definition
A polygon with 10 sides
Term
N-gon
 Definition
A polygon with n sides
Term
Equiangular Polygon
 Definition

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Polygon with all equal angles
Term
Equilateral Polygon
 Definition
Polygon with all equal sides
Term
Regular Polygon
 Definition
Polygon with both equal sides and angles
Term
Diagonal
 Definition
Connects two vertexes of a polygon through the polygon
Term
Supplementary Angles
 Definition
Angles that add to 180
Term
Complementary Angles
 Definition
Angles that add to 90
Term
Isosceles Triangle
 Definition
A triangle with at least two equal sides
Term
Equilateral Triangle
 Definition
A triangle with all equal sides
Term
Acute Triangle
 Definition
A triangle with all acute angles
Term
Right Trianle
 Definition
A triangle with one right angle
Term
Obtuse Triangle
 Definition
A triangle with oneobtuse angle
Term
Parallelogram
 Definition
A quadrilateral with two sets of parallel sides
Term
Trapezoid
 Definition
A quadrilateral with exactly one set of parallel sides
Term
Rectangle
 Definition
A quadrilateral with four right angles
Term
Rhombus
 Definition
A quadrilateral with four equal sides
Term
Square
 Definition
A quadrilateral with four equal sides and four right angles
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