ray - a part of a line that has one endpoint and goes on forever in one direction without ending, line - a straight set of points that extend in opposite directions, parallel lines - lines that are always the same distance apart, parallel lines do not meet, perpendicular lines - lines that meet or cross each other to form right angles, acute - an angle with a measure that is greater than 0 and less than 90, obtuse - an angle with a measure that is greater than 90 and less than 180, angles - a figure that is formed by two rays with the same endpoint, triangle - a polygon with three sides and angles, acute triangle - triangle with all 3 angles acute, right triangle - triangle with 1 right angle, obtuse triangle - triangle with 1 obtuse angle, symmetry - a line that divides a shape or object into two identical parts,

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