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Geometry Terms - End of Module 4
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Terms in this set (27)
Point
A specific place, marked by a dot and usually named with a letter.
Line
A straight path that goes on forever in both directions.
Line Segment
A part of a line that has two endpoints.
Ray
A ray has an endpoint on one side and keeps going forever on the other.
Intersecting lines
Two lines that cross
Parallel lines
Two lines that will never cross.
Perpendicular lines
Two lines that make right angles when they cross.
Right angle
An angle that measures 90 degrees.
Acute angle
An angle that measures less than 90 degrees.
Obtuse angle
An angle that is more than 90 degrees.
Straight angle
An angle that measures 180 degrees.
vertex
The vertex is the point where two rays or line segments meet to form an angle.
Equilateral Triangle
A triangle that has all three sides the same length.
Isosceles Triangle
A triangle with two sides that have the same length.
Scalene Triangle
A triangle with no equal length sides.
Right Triangle
A triangle that has a 90 degree angle.
Acute Triangle
a triangle that has all angles less than 90 degrees
Obtuse Triangle
A triangle that has one angle that is greater than 90 degrees.
Quadrilateral
Any shape that is a polygon and has four sides.
Rectangle
Opposite sides are parallel and same size. Shape has four right angles.
Square
All four sides are congruent and parallel. There are four right angles.
parallelogram
Four sided shape. Opposite sides are congruent and parallel.
rhombus
A four sided shape with all sides the same size and opposite sides parallel.
trapezoid
A four sided shape with only one set of parallel lines.
Line of Symmetry
An object can have a line drawn down the center
Complementary Angle
two angles that add up to 90 degrees
Supplementary Angle
two angles whose measures have a sum of 180 degrees
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