# Q3, W1: January 4 – 7 Geometry Teacher Kristin Andreason Geometry Honors 8 January 4-7 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.
• use triangle similarity to solve problems
• use triangle similarity to prove relationships in geometric figures.
Classroom Activities

Tuesday:

1. Students will choose cartoon and set up Dilations Project
2. Students will then do IXL P.5

Wednesday:

1. Students will take notes on Parts of Similar Triangles and Triangle Angle Bisector Theorem
2. Students will do the practice problems

Thursday/Friday:

1. Students will do guided notes on Triangle Proportionality Theorem and Parallel Lines and Proportional Parts.
2. Students will do the homework practice sheets.
3. Students will finish up the IXL’s.
Assignments Due
• Practice sheet on Triangle Proportionality Theorem.
• IXL P.5