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Table of Contents
Welcome! (Introduction)
Geometry Resources
HSG.CO.A.1
Congruent Segments: Quick Exploration
Animation 18
Congruent Angles: Definition
Animation 36
Midpoint Definition
Animation 56
Segment Bisectors (Definitions)
Perpendicular Bisector Definition
Animation 15
Angle Bisector Definition (I)
Complementary Meaning?
Animation 48
Supplementary Angles (Quick Exploration)
Animation 19
Circle vs. Sphere
HSG.CO.A.2, A.3, A.4, A.5
Translations and Rotations
Translating Triangle by a Vector
Reflections
Reflections Introduction
Flip Flop Reflection
Tool for compositions of rigid transformations and dilations
Applet for Multiple Transformations
Messing With Lisa
Rotations: Introduction
Reflections and Translations
Tessellation by Translation
Parallel Translation
Transformations: Exercise 1
Transformations: Exercise 2
Transformations: Exercise 3
HSG.CO.B.6
Are the triangles congruent (part 2)?
Are the triangles congruent (part 3)?
HSG.CO.B.7
Proving Tri's Congruent (I)
Proving Tri's Congruent (II)
SAS: Exercise 1
SAS: Exercise 2
SAS: Exercise 3
SSS: Exercise 1
SSS: Exercise 2
SSS: Exercise 3
HSG.CO.B.8
SAS: Dynamic Proof!
SSS: Dynamic Proof!
SSS: Dynamically Illustrated
ASA Theorem?
Exploring SSA
Is "SSA" Legit? What Do You Think?
HSG.CO.C.9
Vertical Angles Theorem
Animation 1
Exploring Corresponding Angles (V2)
Alternate Interior Angles Theorem (V1)
Exploring Alternate Interior Angles (V2)
Alternate Interior Angles Theorem (V3)
Animation 16
Alternate Exterior Angles Theorem (V1)
Exploring Alternate Exterior Angles (V2)
Animation 39
Animation 60
Same Side Interior Angles Theorem
Animation 29
Exploring Same Side Exterior Angles
Animation 73
Solution to Parallel Lines & Angles Problem
A Special Theorem: Part 1 (V1)
A Special Theorem: Part 2 (V1)
Animation 57
Another Special Theorem: Part 1 (V1)
Another Special Theorem: Part 2 (V1)
Animation 58
HSG.CO.C.10
Area of a Triangle (Discovery)
Triangle Angle Theorems
Triangle Angle Theorems (V2)
Transformation Proof 3
Triangle Angle Sum Theorem
Animation 2
Triangle Exterior Angle
Animation 102
Angles of a Right Triangle
Animation 104
Exterior Angles of a Triangle
Animation 22
Isosceles Triangle Theorem: Discovery Lab
A Special Triangle & Its Properties (I)
Animation 8
Converse of IST (V1)
Animation 82
Animation 23
Another Special Triangle and its Properties (II)
Animation 27
Converse of IST (II)
Animation 84
Special Right Triangle (I)
Animation 59
Special Right Triangle (II)
Another Special Right Triangle (Guided Discovery)
Animation 42
Triangle Midsegment Action!
Midsegment of a Triangle
Points of Concurrency: Investigation
Orthocenter Exploration
Circumcenter (& Questions)
Circumcenter & Circumcircle Action!
Animation 28
Midpoint of HYP
Animation 46
Incenter Exploration (A)
Incenter Exploration (B)
Incenter & Incircle Action!
Animation 17
Medians Centroid Theorem (Proof without Words)
Medians and Centroid Dance
Animation 25
Medians & Equal Areas!
Animation 74
Animation 90
Euler Line (Informal Investigation)
Napoleon Motion!
Animation 14
Vivani Action!
Equilateral Action (1)!
Animation 91
Equilateral Action (2)!
Animation 94
Equilateral Action (3)!
Animation 107
9 Point Circle Action
Animation 34
9-Point Circle Action (Part 2)
Animation 106
9-Point Circle Action (Part 3A)
Animation 71
9-Point Circle Action (Part 3B)
9-Point Circle Action (Part 4)
Animation 53
9-Point Circle (Informal Investigation)
Euler Line Generator
HSG.CO.C.11
Parallelogram: Area
Parallelogram Construction Template & Discovery Lab