In this Illustration students are trying to find the fourth vertex of a parallelogram given only three vertices. While students use the properties of parallelograms and an informal understanding of slope to find a fourth vertex, they eventually come to realize more than one point could be the fourth vertex.
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Explore this site to learn more about the Common Core Standards for Mathematical Practice (SMP) and how they can be connected to the content standards. Use our Illustrations, centered on student dialogues, to see the Standards for Mathematical Practice in action.
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