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| Point: An exact position, often marked by a dot. |
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| Line: A set of points that forms an endless straight path in opposite directions. |
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| Line segment: A part of a line with two endpoints. |
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| Intersecting lines: Lines that cross at one point. |
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| Parallel Lines: Lines that never cross. |
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| Ray: A part of a line with only one endpoint. |
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| Angle: Two rays with the same endpoint; that endpoint is the vertex of the angle. |
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| Right angle: An angle that makes a square corner. |
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| Perpendicular: Two lines, line segments or rays that make a right angle. |
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| Acute angle: An angle that is open less than a right angle. |
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| Obtuse angle: An angle that is open more than a right angle. |
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| Polygon: A closed figure made up of line segments. |
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| Diagonal: A line segment that connects two vertices of a polygon that are not next to each other. |
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| Triangle: A polygon with three sides. |
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| Quadrilateral: A polygon with four sides. |
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| A polygon with six sides. |
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| Octagon: A polygon with eight sides. |
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| Equilateral Triangle: A triangle having three sides of the same length. |
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| Isosceles Triangle: A triangle with at least two sides having the same length. |
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| Scalene Triangle: A triangle in which no sides have the same length. |
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| Right triangle: A triangle in which one angle is a right angle. |
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| Acute triangle: A triangle in which all three angles are acute angles. |
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| Trapezoid: A quadrilateral with exactly one pair of parallel sides. |
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| Parallelogram: A quadrilateral with two pairs of parallel sides. |
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| Rhombus: A special parallelogram in which all sides are the same length. |
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| Vertex: The endpoint of two rays that form an angle. |
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| Vertex of a polygon: The point where two sides of a polygon meet. |
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| Side: A line segment that forms part of a polygon. |
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| Pentagon: A polygon with five sides. |
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| Decagon: A polygon with ten sides. |
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| Obtuse Triangle: A triangle in which one angle is an obtuse angle. |
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Definition
| Square: A special parallelogram with four right angles and all sides the same length. |
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| Rectangle: A special parallelogram with four right angles. |
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