# Q2, W8: December 9-13 Geometry Teacher Kristin Andreason Geometry Honors 8 December 9-13 Unit 3: Similarity
Standard(s) Taught

MAFS.912.G-SRT.2.4: Prove theorems about triangles. (Theorems include: Triangle Proportionality Theorem or Side Splitter Theorem – a line parallel to one side of a triangle divides the other two proportionally.)

MAFS.912.G-SRT.2.5: Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

Learning Targets and Learning Criteria
• apply theorems, postulates, or definitions to prove theorems about triangles and proportional parts of parallel lines, including:
1. Triangle Proportionality Theorem- A line parallel to one side of a triangle divides the other two proportionally.
2. Converse of Proportionality Theorem- If a line divides two sides of a triangle proportionally, then it is parallel to the third side
3. Triangle Midsegment Theorem (side splitter theorem as applied to triangle) – a midsegment of a triangle is parallel to one side of a triangle and its length is one-half the length of that side.

Classroom Activities

Monday/Tuesday:

• Students will finish the Similarity Scavenger Hunt
• Students will take guided notes on Triangle Proportionality Theorem and Proportional Parts & Parallel Lines
• Students will do a practice sheet on these theorems.
• Students will do IXL P.10.

Wednesday:

• Students will do guided notes on Parts of Similar Triangles and the Angle Bisector Theorem.
• Students will do practice problems on each of these.

Thursday?Friday:

• We will review for SMT #2.
Assignments Due
• Similarity Scavenger Hunt is due by December 10.
• IXL P.10 is due by Friday December 13.