Proving Triangle Similarity
Grade 10th Grade · Math · 45 min
What's Included
Learning Objective
I can prove that two triangles are similar using the AA, SAS, and SSS similarity theorems.
Warm-Up Video
HCCMathHelp · 6:58
Triangle Similarity - SSS, SAS, and AA 128-2.28
Guided Notes
3 key concepts
- 1
Side-Side-Side (SSS) similarity states that two triangles are similar if the lengths of their corresponding sides are proportional.
- 2
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.
- 3
Angle-Angle (AA) similarity states that two triangles are similar if they have two pairs of corresponding angles that are congruent.
Practice Questions
9 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“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
