# Q3, W1: January 4-7 Pre-Algebra

Teacher Kristin Andreason Pre-Algebra 8 January 4-7 Focus 7: Angle Pair Relationships
Standard(s) Taught

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 and why this is so.

Learning Targets and Learning Criteria
• Informally prove the anglesum 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

Tuesday:

• Students will create a graphic organizer on Parallel Lines Cut By a Transversal
• Students will make a foldable on Parallel Lines Cut By a Transversal

Wednesday:

• Students will do a Scavenger Hunt on Parallel Lines Cut By a Transversal

Thursday/Friday:

• Students will take notes on Triangle Angle Sum Theorem and Exterior Angle Theorem
• Students will do IXL’s Q.9 and Q.12
Assignments Due
• IXL’s Q.9 and Q.12
• Scavenger Hunt on Parallel Lines Cut By a Transversal (6th and 7th periods only)