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Handout
Oswego City School District

Regents Exam Prep Center: Theorems and Postulates for Geometry

For Students 9th - 10th Standards
Here is a partial list of theorems, postulates, and properties.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Midpoints of the Sides of a Paralellogram

For Teachers 9th - 10th Standards
Suppose that ABCD is a parallelogram and that M and N are the midpoints of lines AB and CD respectively. Students are asked to prove that MN=AD, and that the line MN is parallel to line AD. Aligns with G-CO.C.11.
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Parallelograms and Translations

For Teachers 9th - 10th Standards
In this task, students apply the definition of a parallelogram in the context of a geometric construction. Aligns with G-CO.C.11.