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  • Geometry: Triangle Theorems
  • Theorems Involving Angles
  • Triangle Theorems (General)
  • Points of Concurrency
  • Points of Concurrency - Extension Activities
  • Older (Earlier) Applets

Geometry: Triangle Theorems

Author:
Jenny Secor, Tim Brzezinski
Topic:
Geometry
Geometry: Triangle Theorems

Table of Contents

  • Theorems Involving Angles

    • Triangle Angle Theorems
    • Triangle Angle Theorems (V2)
    • Triangle Angle Theorems (V3)
    • Triangle Angle Sum Theorem
    • Exterior Angles of a Triangle
  • Triangle Theorems (General)

    • Isosceles Triangle (Properties)
    • Midsegment of a Triangle
    • A Special Theorem: Part 1 (V1)
    • A Special Theorem: Part 2 (V1)
    • Another Special Theorem: Part 1 (V1)
    • Another Special Theorem: Part 2 (V1)
    • Similar Right Triangles (V1)
    • Another Special Triangle and its Properties (II)
    • Another Special Right Triangle (Guided Discovery)
    • A Special Triangle & Its Properties (I)
    • Special Right Triangle (I)
    • Acute, Right, or Obtuse?
    • Acute, Right, Obtuse (III)
    • Napoleon Motion!
    • Isosceles Triangle Medians
  • Points of Concurrency

    • Incenter Exploration (A)
    • Incenter Exploration (B)
    • Orthocenter (& Questions)
    • Circumcenter (& Questions)
    • Medians Centroid Theorem (Proof without Words)
    • Euler Line (Informal Investigation)
    • Midpoint of HYP
    • Incenter & Incircle Action!
    • Medians and Centroid Dance
    • Circumcenter & Circumcircle Action!
  • Points of Concurrency - Extension Activities

    • 9-Point Circle (Informal Investigation)
    • 3 Special Points!
    • 9-Point Circle Action (Part 1)
    • 9-Point Circle Action (Part 2)
    • 9-Point Circle Action (Part 3A)
    • 9-Point Circle Action (Part 4)
    • 9-Point Circle Action (Part 3B)
  • Older (Earlier) Applets

    • Perpendicular Bisector Theorem (Part 1)
    • Perpendicular Bisector Theorem (Part 2)
    • Angle Bisector Theorem (Part 1)
    • Angle Bisector Theorem (Part 2)
Next
Triangle Angle Theorems

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