point - A location in space, ray - A straight path that goes on forever in only one direction and has one endpoint., line - a straight path that goes on forever in both directions, line segment - a straight path with two endpoints, vertex - the point where two lines touch, parallel lines - Lines that never intersect, perpendicular lines - Line that intersect at right angles, or 90 degrees, intersecting lines - lines that intersect, usually at obtuse or acute angles, angle - the space between two intersecting lines, measured in degrees, right angle - 90 degrees, obtuse angle - greater than 90 degrees, less than 180, acute angle - less than 90 degrees, straight angle - 180 degrees, reflex angle - more than 180 degrees, less than 360 degrees, Degrees in a full circle turn - 360, Degrees in one fourth (1/4) of full circle turn - 90, Degrees in one half (1/2) of full circle turn - 180, Degrees in three fourths (3/4) of full circle turn - 270, Acute triangle - A triangle with 3 acute angles, right triangle - A triangle with 1 right angle, 2 acute angles, obtuse triangle - A triangle with 1 obtuse angle, 2 acute angles, equilateral triangle - A triangle with three equal sides, scalene triangle - A triangle with no equal sides, isosceles triangle - A triangle with 2 equal sides,

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