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Geometry
Page 101
28
Mathematics
7th Grade
02/19/2009

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Term
Acute Angle
Definition
An angle with measure greater than 0 degrees and less than 90 degrees
Term
Right Angle
Definition
An angle that measures 90 degrees.
Term
Obtuse Angle
Definition
An angle with measure greater than 90 degrees and less than 180 degrees.
Term
Vertical Angles
Definition
The opposite angles where two lines meet.
Term
Acute Triangle
Definition
A triangle in which all three angle measures are less than 90 degrees
Term
Right Triangle
Definition
A triangle in which one angle is a right angle.(measures 90 degrees)
Term
Obtuse Triangle
Definition
A triangle with an obtuse angle (greater than 90 degrees)
Term
Scalene Triangle
Definition
A triangle with no equal side lengths
Term
Isosceles Triangle
Definition
A triangle with two or more sides of equal length.
Term
Equilateral Triangle
Definition
A triangle with all side lengths equal.
Term
Trapezoid
Definition
A quadrilateral with one pair of parallel sides.
Term
Parallelogram
Definition
A quadrilateral with both pairs of opposite sides parallel.
Term
Rectangle
Definition
A quadrilateral with four right (90 degree) angles.
Term
Rhombus
Definition
A quadrilateral with all four sides of equal length.
Term
Square
Definition
A special rectangle with all sides of equal length.
Term
Polygon
Definition
A two-dimensional closed figure of straight line segments (called edges or sides) connected end to end.
Term
Regular Polygon
Definition
A polygon in which all side lengths are equal and all angle measures are equal.
Term
Quadrilateral
Definition
A polygon with four sides
Term
Pentagon
Definition
A polygon with 5 sides
Term
Hexagon
Definition
A polygon with 6 sides
Term
Octagon
Definition
A polygon with 8 sides
Term
Vertex
Definition
The point where two consecutive sides of a polygon meet.
Term
Diagonal
Definition
A line segment that connects two vertices of a polygon and is not a side.
Term
Circle
Definition
A set of points at a fixed distance (radius) from a point (Center).
Term
Parallel Lines
Definition
Two straight lines on a two-dimensional plane that do not intersect no matter how far they are extended
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