Term
| concave (nonconvex) polygon |
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Definition
| A polygon in which at least one vertex is "pushed in." |
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Definition
| A polygon in which all vertices are "pushed outward." |
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Definition
| A point at the end of a line segment or ray. |
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Definition
| Informally, a straight path that extends infinitely in opposite directions. |
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Definition
| A straight path joining two points. |
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Definition
| A quadrilateral that has two pairs of parallel sides. Opposite sides are equal length. Opposite angles have the same measure. |
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Definition
| A 2-dimensional figure that is made up of three or more line segments joined end to end to make one closed path. The line segments may not cross. |
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Term
| quadrangle (quadrilateral) |
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Definition
| A polygon that has four sides and four angles. |
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Definition
| A straight path that extends infinitely from its endpoint. |
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Definition
| A quadrilateral whose sides are all the same length and opposite sides are parallel. |
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Definition
| A quadrilateral that has exactly one pair of parallel sides. |
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Term
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Definition
| The point where the rays of an angle, the sides of a polygon, or the edges of a polyhedron meet. |
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