# Q2, W8: January 11 – 15 Pre-Algebra Teacher Kristin Andreason Pre-Algebra 8 January 11-15 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 why this is so.

Learning Targets and Learning Criteria
• 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

Monday/Tuesday:

1. Students will log onto the Zoom session.
2. We will review Parallel Lines Cut by a Transversal.
3. Students will take notes on Triangle Angle Sum Theorem and External Angle Theorem.
4. Students will finish scavenger hunt and IXL O.17.
5. Students will do IXL’s O.9 and O.12.

Wednesday:

1. Students will log onto the Zoom session.

Thursday/Friday:

1. Students will log onto the Zoom session.
2. Students will do a review for the SMT 2.
Assignments Due
• Angle Pairs Scavenger Hunt.
• IXL O.17
• IXL’s O.9 and O.12.