point, a single location in space, line, a straight row of points that goes on forever in both directions, line segment, a straight row of points that starts at one point and ends at another point, ray, a straight row of points that starts at one point and goes on forever in one direction, angle, a geometric shape formed by two rays, lines, or line segments that meet at a common point, perpendicular lines, two lines that meet and form a right angle, or a 90 degree angle, right angle, an angle that forms a 90 degree angle and looks like a square corner, acute angle, an angle that forms less than a 90 degree angle, obtuse angle, an angle that forms more than a 90 degree angle, straight angle, an angle that forms a straight line and measures 180 degrees, parallel lines, lines that are always the same distance apart and never cross

Geometry

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