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| A figure that is formed by two rays or two line segments with a common endpoint. |
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| The point at which the rays or line segments of an angle, the sides of a polygon, or the edges of a polyhedron meet. |
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| An angle whose measure is 90 degrees. |
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| A polygon with three sides and three angles. |
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| Same as quadrilateral. A 4-sided polygon. |
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| A rectangle whose sides are all the same length. |
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| A parallelogram with all sides the same length. The angles may be right angles, in which case the rhombus is a square. |
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| A parallelogram whose angles are all right angles. |
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| A quadrilateral that has two pairs of parallel sides. All rectangles are parallelograms, but not all parallelograms are rectangles because parallelograms do not need to have right angles. |
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| A quadrilateral that has exactly one pair of parallel sides. No two sides need be the same length. |
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| A quadrilateral with exactly two pairs of adjacent sides that are the same length. (A rhombus is not a kite.) Compare to rhombus. |
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