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# Geometric terms

Angle Formed when two rays or line segments meet at a common vertex
Vertex a point where two or more straight lines meet.
Ray starts at a given point and goes off in a certain direction forever, to infinity.
Line Segment a straight line with two end points; contains every point on the line between its end points
Right Angle forms a square corner and measures 90 degrees
Straight Angle forms a straight line and measures 180 degrees
Acute Angle is smaller than a right angle and measures less than 90 degrees.
Obtuse Angle is larger than a right angle and measures more than 90 degrees, but less than 180 degrees.
Congruent figures that have the same shape and same size
Similar figures that have the same shape
Symmetry a figure is symmetrical if, when folded down the middle, it has two matching halves.
Line of Symmetry the folded line when finding symmetry.
Polygon flat shape consisting of straight lines that are joined to form a closed chain or circuit; means many
Triangle a polygon that has 3 sides
Quadrilateral a polygon that has 4 sides
Pentagon a polygon that has 5 sides
Hexagon a polygon that has 6 sides
Heptagon a polygon that has 7 sides
Octagon a polygon that has 8 sides
Nonagon a polygon that has 9 sides
Decagon a polygon that has 10 sides
Created by: auriel