Lesson plan

Recognize if a quadrilateral is a parallelogram by using known properties of the given quadrilateral

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teaches Common Core State Standards HSG-CO.C.11 http://corestandards.org/Math/Content/HSG/CO/C/11
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Big Ideas: Students can use the properties of a parallelogram to prove that a quadrilateral is a parallelogram. In this lesson students will practice using all known properties of a parallelogram to determine if a quadrilateral is a parallelogram. Vocabulary: parallelogram, opposite sides, opposite angles, adjacent angles, diagonals, bisect, congruent, rectangle, rhombus, square Special Materials: None.