isosceles triangle - triangle with 2 equal sides, scalene triangle - triangle with no equal sides, equilateral triangle - triangle with 3 equal sides, parallel - stays the same distance apart; never intersect, perpendicular - intersect forming 4 right angles, right angle - angle that measures 90º, obtuse angle - angle that measures more between 90º and 180º, acute angle - angle measuring less than 90°, vertex/vertices - where two or more lines meet, rectangle - quadrilateral that has four right angles, intersecting lines - lines that pass through the same point, polygon - a closed figure made of line segments,

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