Q3, W7: February 17-21 Geometry

TeacherKristin Andreason
Subject AreaGeometry Honors
Grade Level8
Week #February 17-21
Unit of InstructionUnit 5: Quadrilaterals and Coordinate Geometry
Standard(s) Taught

MAFS.912.G-CO.3.11:  Prove theorems about parallelograms; use theorems about parallelograms to solve problems. (Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.)

MAFS.912.G-GPE.2.4: Use coordinates to prove simple geometric theorems algebraically.

Learning Targets and Learning Criteria
  • choose appropriate formula (such as distance, midpoint, or slope) to identify the geometric figure and its properties.
  • prove or disprove that a figure defined by given points in the coordinate plane is a triangle, rectangle, kite, rhombus, trapezoid, square, regular polygon, etc.
  • use coordinates and the appropriate formula to prove or disprove a claim about a figure.
  •  Use properties of parallelograms, NOT assumptions, to correctly identify figures.
Classroom Activities


  • We will look at the Proofs of Theorems about Parallelograms on MathBitsNotebook.
  • Students will work in groups to create posters that illustrate the four basic proofs.


  • Students will finish their posters.
  • Each group will present their proof to the class.


  • Students will create page 42 in their ISN (Proving Quadrilaterals are Parallelograms).
  • Students will then work on problems to Prove Properties of Parallelograms using distance, midpoint, and slope formulas.
Assignments Due
  • Posters are due by February 19.
  • Proving Properties of Parallelograms are due February 26.


Additional Resources

All IEP and ESOL accommodations are provided daily.