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Definition
| flat surface that extends in all directions without end |
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| figure made up of straight lines and angles |
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| a polygon with 3 sides and 3 angles |
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| a polygon with 4 sides and 4 angles |
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| a polygon with 5 sides and 5 angles |
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| a polygon with 6 sides and 6 angles |
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| all sides are equally long, and all angles are equal in measure |
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| one angle is a right angle, or 90 degrees |
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| all 3 angles measure less than 90 degrees |
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| one angle is an obtuse triangle, or greater than 90 degrees |
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| all sides are congruent, or equal |
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| at least 2 sides are congruent, or equal |
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| no sides are congruent, or equal |
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| a quadrilateral with 2 pairs of parallel sides (a leaning rectangle) |
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| a parallelogram with 4 right angles |
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| a rectangle with 4 congruent (equal) sides |
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| a quadrilateral with 1 pair of parallel sides (a triangle with the top cut off) |
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Term
| total number of degrees of the angles of a quadrilateral |
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