# Q3, W2: January 10-14 Pre-Algebra Teacher Kristin Andreason Grade 8 Pre-Algebra 8 January 10-14 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

Monday/Tuesday:

• I will give students notes on Angle Relationships and we will go over them
• I will explain the similar triangles as it relates to dilations
• We will do some of IXL S.5 and S.6 together to check for understanding
• We will review Parallel Lines Cut By a Transversal
• Students will finish IXL’s Q.9 and Q.12 (of not) and then work on IXL Q.17
• I will preview the worksheet on Angles and Equations they will do tomorrow

Wednesday:

• Students will do a worksheet on Angles and Equations (and coloring activity)

Thursday/Friday:

• Students will do IXL’s Q.15 and Q.18 (using their notes on Angle Relationships)
• Students will then finish the coloring activity (Angles and Equations)
Assignments Due
• IXL’s Q.15 and Q.18
• Angles and Equations Activity