Proving Triangle Similarity
Learning Objective
I can prove that two triangles are similar using the AA, SAS, and SSS similarity theorems.
Lesson Flow
Watch Video
Triangle Similarity - SSS, SAS, and AA 128-2.28
HCCMathHelp
Guided Notes
Key concepts students will learn:
- •
Side-Side-Side (SSS) similarity states that two triangles are similar if the lengths of their corresponding sides are proportional.
- •
Side-Angle-Side (SAS) similarity states that two triangles are similar if they have two pairs of corresponding sides that are proportional and the included angles are congruent.
- •
Angle-Angle (AA) similarity states that two triangles are similar if they have two pairs of corresponding angles that are congruent.
Practice
9 questions • Multiple choice & Short answer
Exit Ticket
“Triangle PQR has sides PQ = 6, QR = 8, and RP = 10. Triangle XYZ has sides XY = 18, YZ = 24, and ZX = 30. Are these triangles similar? Show the ratios of corresponding sides to justify your answer.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
