Q2, W7: December 2-6 Pre-Algebra

TeacherKristin Andreason
Subject AreaPre-Algebra
Grade Level8
Week #December 2-6
Unit of InstructionFocus 6: Transformations and Focus 7: Angle Pair Relationships
Standard(s) Taught

MAFS.8.G.1.4: Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them.

MAFS.8.G.1.5: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles.  For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.

Learning Targets and Learning Criteria
  • explain how transformations can be used to prove that two figures are similar. 
  • describe a sequence of transformations to prove or disprove that two given figures are similar. 
  • know the definition of similar and why dilation alone is not enough to determine similarity. 
  • informally prove the angle-sum theorem, the properties of angles when parallel lines are cut by a transversal and the angle-angle criterion for similar triangles. 
  • prove that the sum of any triangle’s interior angles will have the same measure as a straight angle. 
  • make conjectures regarding the relationships and measurements of the angles created when two parallel lines are cut by a transversal. 
  • apply proven relationships to establish minimal properties to justify similarity. 
  • present informal arguments as to whether or not triangles are similar based on Angle-Angle criterion. 
Classroom Activities


  • We will discuss the connection between dilations and similar figures.
  • We will review all transformations.
  • Students will do a Math Pennant Activity to practice all transformations.
  • Students will do IXL Q.5.


  • I will introduce Parallel Lines Cut By Transversals.
  • Students will create a graphic organizer and a foldable on Parallel Lines Cut By Transversals.


  • Students will do three rotations:  a Parallel Lines Cut By Transversals scavenger hunt, task cards on Parallel Lines Cut By Transversals, and IXL O.17.
Assignments Due
  • Math pennants due by Monday/Tuesday December 2/3.
  • IXL Q.5 due by Wednesday, December 4.
  • Scavenger hunt/task cards, and IXL O.17 due by Monday/Tuesday December 9/10/
Additional Resources

All IEP and ESOL accommodations are provided daily.