line, a straight path of points that continues without end in both directions, line segment, part of a line between two endpoints, ray, part of a line that has one endpoint and continues on without end in one direction, point, an exact location in space, angle, the amount of turning between 2 rays measured in degrees, quadrilateral, a polygon with 4 sides and 4 angles, equilateral triangle, a triangle with 3 equal sides and angles, isosceles triangle, a triangle with 2 equal sides and angles, scalene triangle, a triangle with 3 different sides and angles, symmetry, a shape has symmetry when one half of the shape is a mirror image of the other half, parallel lines, lines that are always an equal distance apart and will never intersect, perpendicular lines, lines that intersect to form right angles, right angle, an angle that measures exactly 90 degrees, acute angle, an angle that is less than 90 degress, obtuse angle, an angle that is greater than 90 degrees and less than 180 degress, straight angle, an angle that measures exactly 180 degrees, degrees, the unit used to measure the size of an angle, protractor, the tool used to measure degrees in an angle, intersect, when lines meet or cross over one another

Geometry Vocabulary

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