• Quadrilaterals are used in designs in the fields of architecture, textiles, engineering and
  interior decorating.

• What are the definitions of each of the special quadrilaterals?
• What are the properties of each of the special quadrilaterals?
• How can you prove that a quadrilateral is a parallelogram?
• What are the methods for proving that a quadrilateral is a rectangle, rhombus, square, kite or isosceles trapezoid?

• To be able to prove that a quadrilateral
  is a parallelogram.
• To be able to define the properties of
  each of the special quadrilaterals.
• To be able to identify the properties of
  each of the special quadrilaterals.

• Practice problems
• Quizzes
• Tests

Activities:

• Complete problems to prove that a quadrilateral is a parallelogram.
• Complete problems involving measurements using the properties of special quadrilaterals.
• Complete a mind map using the definitions and properties of quadrilaterals.

State Goals:

• 9.B.4 Recognize and apply relationships within and among geometric figures.
• 9.C.4c Develop and communicate mathematical proofs.