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| A 2-dimensional figure with straight-line segments |
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| A 4-sided, closed, simple figure |
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| A parallelogram with 4 equal sides |
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| A quadrilateral with 2 pairs of parallel sides |
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| A parallelogram with right angles |
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| A rectangle with equal sides |
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| A quadrilateral with at least one pair of parallel sides |
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| A quadrilateral with at least one pair of parallel sides |
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| Two lines that never intersect |
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| Two lines that intersect at right angles |
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| A triangle with 3 congruent sides |
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| A triangle with at least 2 congruent sides |
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| A triangle with no congruent sides |
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| A polygon with all angles less than 180 degrees |
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| A polygon with at least one angle greater than 180 degrees |
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| Separates a figure into two congruent parts such that each point in one part is reflected in the other part |
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| Shapes that have the same size and shape |
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| Shapes whose corresponding angles are equal and corresponding sides are in the same ratio |
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| Motions with images such as sliding, flipping, rotating |
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| Any solid whose faces are all polygons |
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| A two-dimensional polygon that forms one of the sides of a polyhedron |
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| A point at which 3 or more edges come together |
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| A straight edge formed by 2 faces |
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| Two bases that are congruent and in parallel planes and all lines joining corresponding points on the bases are parallel |
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| Has two faces that are congruent circles joined by a curved surface |
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| A solid that has congruent and parallel bases (top and bottom) joined by rectangular faces |
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| A cylinder whose faces are congruent |
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| 3-dimensional shapes with at least one face called the base and a vertex that is outside the base |
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| Cones with polygons as the base |
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| Models that emphasize faces (eg. Paper tubes) |
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| Models that emphasize edges (eg. toothpicks & gumdrops) |
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| Thinking mentally about manipulating two- and three-dimensional objects |
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