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Quadrilateral: a plane figure with four edges and for vertices. This is the general name for all four-sided shapes. There are many different names for the different kinds. Square: a four edge, four vertices, and four angle plane figure. All the edges are congruent. All of the angles are exactly 90°. Rectangle: a four edge, four vertices, and four angle plane figure. Parallel sides are congruent. All of the angles are exactly 90°. Parallelogram: a four edge, four vertices, and four angle plane figure. Parallel sides are congruent. Opposite angles are congruent. Not all of the angles have to be 90°. Trapezoid: a four edge, four vertices, and four angle plane figure. It has one set of parallel edges. The other edges would cross if they were to be extended. Rhombus: a four edge, four vertices, and four angle plane figure. All of the sides are congruent. Opposite angles are congruent. Not all of the angles have to be 90°. Notice, some of the quadrilaterals can go by several names. For example, a square can be a rectangle, parallelogram, and a rhombus. Explore the links to learn more about the different quadrilaterals. |
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