- congruent triangle
- SSA Theorem?
- SAS: Dynamic Proof!
- SSS: Dynamic Proof!
- Triangle Exterior Angle
- Triangle Angle Theorems (V1)
- Circumcenter (& Questions)
- Triangle Angle Sum Theorem
- Triangle Altitude Illustrator & Definition Writing Prompt
- Triangle Inequality (II)
- Rectangle Diagonals
- Orthocenter (& Questions)
- Exterior Angles of a Triangle
- Triangle Median Illustrator & Definition Writing Prompt
- Animation 27
- Area of a Triangle (Discovery)
- Triangle Inequality
- Special Line through Triangle V1 (Theorem Discovery)
- Isosceles Triangle (Properties)
- Triangle Angle Theorems (V2)
- Animation 102
- Exterior Angles of a Triangle
- Exterior Angle of Triangle
- Exterior Angle Theorem
- Exterior Angle Theorem
