Congruent Triangles

6 online lessons · 1 in-person Review & Practice Day

Proving two triangles are exactly the same shape and size — the workhorse of every geometry proof to come.

Lessons

• 4.1 Classifying Triangles (by sides and angles) ~15–30 min
• 4.2 Triangle Angle Sum and Exterior Angle Theorems ~15–30 min
• 4.3 Proving Congruence: SSS and SAS ~15–30 min
• 4.4 Proving Congruence: ASA, AAS, and HL ~15–30 min
• 4.5 CPCTC and Proof Applications ~15–30 min
• 4.6 Isosceles and Equilateral Triangle Theorems ~15–30 min