Lesson Plan: Properties of Parallelograms Mathematics • 11th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to identify and use the properties of parallelograms and classify special types of parallelograms.


Students will be able to

  • recognize the following properties of a parallelogram:
    • opposite sides are parallel,
    • opposite sides are equal in length,
    • opposite angles are equal in measure,
    • the sum of two adjacent angles is 180,
    • the diagonals bisect each other,
  • identify the following special cases of a parallelogram:
    • rectangles,
    • rhombuses,
    • squares,
  • classify quadrilaterals,
  • use the properties of quadrilaterals to find missing lengths and angles in geometric figures.


Students should already be familiar with

  • properties of rectangles and squares,
  • using geometric notation for line segments, line lengths, angles, and angle measures,
  • parallel and perpendicular lines.


Students will not cover

  • finding angle measures (other than right angles) formed by intersecting diagonals, for example, finding the angle formed by the diagonals of a rectangle.

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