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# SarahGeometryTerms

Point Location in Space
Line Points connected in a straight path that goes on in both directions forever.
Line Segment A part of a line with two end points
Ray A part of a line with only one end point
Parallel Lines Two lines that never cross
Intersecting Lines Two lines that will cross at some point
Perpendicular Lines Two lines that for a right angle
Angle Two rays that share the same end point
Vertex A shared end point on an angle
Right Angle a 90 degree angle
Obtuse Angle An angle of more than 90 degrees but less than 180 degrees
Acute Angle An angle less than 90 degrees
Straight Angle An angle of exactly 180 degrees
Triangle A 3-sided polygon
Right Triangle A triangle that has a 90 degree angle
Obtuse Triangle A triangle that has one angle bigger than 90 degrees
Acute Angle A triangle that has all 3 sides less than 90 degrees.
Scalene Triangle A triangle where no sides are the same length
Isosceles Triangle A triangle where at least 2 sides are the same length
Equilateral Triangle A triangle with all 3 sides of equal length
Polygon A closed figure made with 3 or more line segments that may not overlap
Congruent Equal Measure
Convex Polygon All angles pointed outward
Concave polygon One or more angles pointed in "Caved in"
Regular Polygon Sides and angles are all congruent
Decagon 10-sided polygon
undecagon 11-sided polygon
nonagon 9-sided polygon
octagon 8-sided polygon
heptagon 7-sided polygon
hexagon 6-sided polygon
Pentagon 5-sided polygon