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Geometry Vocabulary

Unit 2: Tools of Geometry

TermDefinition
Point a physical location in space that has no length, width, or depth
Line a set of connected points that extends forever in both directions
Line Segment a portion of a line that has a starting and ending point
Ray a portion of a line that has a starting point and then extends forever in one direction
Collinear points lying one the same line
Acute Angle an angle that has a measure less than 90 degrees
Obtuse Angle an angle that has a measure greater than 90 degrees but less than 180 degrees
Right Angle an angle that has a measure of exactly 90 degrees
Straight Angle an angle that has a measure of exactly 180 degrees (also known as a straight line)
Adjacent Angles two non-overlapping angles that share a ray
Vertical Angles pairs of angles that share a vertex and have rays that point in opposite directions (degree measures are equal)
Complementary Angles two angles whose measures add up to 90 degrees
Supplementary Angles two angles whose measures add up to 180 degrees
Midpoint a point that lies exactly in the center or middle of a line segment
Bisector cuts a geometric object into two of the same type of object and have the same measure
Perpendicular describes two lines, segments or rays that form right angles with each other
Parallel two lines that share NO points in common and NEVER intersect
Polygon shapes/figures that are enclosed by straight lines
Trapezoid 4 sided figure with at least one pair of parallel lines
Parallelogram 4 sided figure with exactly two pairs of parallel lines
Transversal a line that crosses through two or more parallel lines
Corresponding angles angles located in the same relative position on the two parallel lines (matching angles)
Exterior outside
Interior inside
Created by: ms.wasserman
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