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# Geometry Vocabulary

Acute angle measures less than 90 degrees
Obtuse measures more than 90 degrees and less than 180 degrees
Right angle measures exactly 90 degrees
Straight angle measures exactly 180 degrees (a straight line)
Reflex angle measures more than 180 degrees
Intersecting two (2) lines or segments that touch or cross each other
Perpendicular two(2) lines or segments that intersect at right angles
Parallel two (2) lines or segments that are the same distance apart at every point and will NEVER intersect
Vertex a corner of an angle or polygon (plural: vertices)
Radius the distance from the center of a circle to its surface
Diameter the distance of a line passing through the center of a circle to its surface (twice the radius)
Perimeter the length of the border (outside) of a 2-D shape
Created by: Bigelow6B