line - a straight path that continues in opposite directions indefinitely, ray - part of a line with one endpoint , line segment - part of a line with two endpoints, point - an exact place or location, right angle - an angle that measures exactly 90 degrees, angle - formed when two rays meet at a common endpoint, obtuse angle - an angle that measures more than 90 degrees (91-179), acute angle - an angle that measures less than 90 degrees (1-89), intersecting lines - lines that cross at any angle, parallel lines - lines that never cross and will always be the same distance apart, perpendicular lines - lines that intersect and form 90 degree angles, adjacent - next to, vertex - where two rays meet to form an angle, line of symmetry - the line on which a figure can be folded so both halves are the same, obtuse triangle - a triangle with 2 acute and 1 obtuse angle, right triangle - a triangle with 2 acute and 1 right angle, straight angle - an angle that measures exactly 180 degrees, acute triangle - a triangle with 3 acute angles, parallelogram - a quadrilateral with two pairs of parallel sides , quadrilateral - a four sided figure, polygon - a closed figure with straight sides, trapezoid - a quadrilateral with only one pair of parallel sides, square - a quadrilateral with 4 right angles and 4 equal sides, congruent - same size, same shape; equal, rhombus - a quadrilateral with 4 equal sides and 2 pairs of parallel sides, rectangle - a quadrilateral with 4 right angles and opposite sides are of equal length, protractor - tool used to measure and draw angles, pentagon - a five sided figure, hexagon - a six sided figure, octagon - an eight sided figure,

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