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Geometry Word List and Definitions parallel lines lines that never intersect perpendicular lines intersect Two lines that intersect to form right angles Lines that meet at one point vertex the point of intersection of lines or the point opposite the base of a figure obtuse angle an angle between 90 and 180 degrees right angle an angle that measures 90 degrees acute angle an angle less than 90 degrees but more than 0 degrees straight angle an angle with a measure of exactly 180 degrees equilateral triangle a three-sided regular polygon scalene triangle a triangle with no two sides of equal length isosceles triangle a triangle with at least two equal sides right triangle a triangle that has a right angle quadrilateral A polygon with 4 sides decagon 10 sided polygon hexagon a polygon with 6 sides octagon A polygon with 8 sides pentagon a five-sided polygon circumference distance around a circle diameter the distance across a circle through its center radius half the distance of the diameter polygon a closed plane figure bounded by straight sides
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