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Triangle Theorems
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Theorems Involving Angles
Triangle Theorems (General)
- Special Line through Triangle V1 (Theorem Discovery)
- Special Line through Triangle V2 (Theorem Discovery)
- Triangle Midsegment Action!
- A Special Triangle & Its Properties (I)
- Converse of IST (V1)
- Another Special Triangle and its Properties (II)
- Triangle Inequality: Discovery Lesson
- Triangle Side Possibilities? (V2)
- Triangle Inequality
- Triangle Inequality (II)
- Inequalities in 1 Triangle
- Another Special Right Triangle (Guided Discovery)
- Special Right Triangle (I)
- Acute, Right, or Obtuse?
- Acute, Right, Obtuse (III)
- Isosceles Triangle Medians
- Special Right Triangle (II)
- SAS: Dynamic Proof!
- SSS: Dynamic Proof!
- SSS: Dynamically Illustrated
- ASA Theorem?
- HL: Hypotenuse-Leg Action!
- Isosceles Triangle Theorem: Discovery Lab
- Geometric Mean Illustration
Points of Concurrency
- Incenter Exploration (A)
- Incenter Exploration (B)
- Incenter & Incircle Action!
- Incenter + Incircle Action (V2)!
- Lines Containing Altitudes of a Triangle (V1)
- Orthocenter Exploration
- Circumcenter (& Questions)
- Circumcenter & Circumcircle Action!
- Triangle Medians: Quick Investigation
- Medians and Centroid Dance
- Medians Centroid Theorem (Proof without Words)
- Midpoint of HYP
- Points of Concurrency: Investigation
- Morley Action!
Points of Concurrency - Extension Activities
Other Triangle Theorems
Older (Earlier) Applets