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GEOMETRY VOCABULARY LIST Parallel Lines – lines that lie on the same plane and never intersect Perpendicular lines – lines that intersect and form a right angle Intersecting Lines – lines that pass through the same point Line – a straight path that continues forever in both directions Line Segment – part of a line with two endpoints Ray – part of a line with one endpoint, with one side extending forever Acute Angle – angle less than 90 degrees Right Angle – angle exactly 90 degrees Obtuse Angle – angle greater than 90 degrees Straight Angle – angle exactly 90 degrees Quadrilateral – four-sided polygon Pentagon – five-sided polygon Hexagon – six-sided polygon Heptagon – seven-sided polygon Octagon – eight-sided polygon Nonagon – nine-sided polygon Decagon – ten-sided polygon Square – quadrilateral with all sides congruent and four right angles Rectangle – quadrilateral with opposite sides congruent and parallel, having four right angles Parallelogram – quadrilateral with opposite sides congruent and parallel Rhombus – quadrilateral with all sides congruent and opposite sides parallel Trapezoid – quadrilateral with only one pair of parallel sides Equilateral Triangle – triangle with all sides congruent Isosceles Triangle – triangle with two sides congruent Scalene Triangle – Triangle with no sides congruent
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