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Congruence (Vol 2)
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Lines and Angles
- Exploring Points, Lines, and Planes (V1)
- Exploring Points, Lines, and Planes (V2)
- Where Did the Plane Go?
- Measuring Length with a Centimeter Ruler
- Segment Addition Postulate: Formative Assessment
- Midpoint Theorem: Formative Assessment
- Measuring Angles with a Protractor
- Angle Sketching by Estimation
- Angle Addition Postulate: Formative Assessment
- Angle Bisector: Formative Assessment
- Open Middle Problem: Complementary and Supplementary Angles
- Open Middle: Supplementary Angles
- Vertical Angles: Quick Exploration
- Vertical Angles Exploration (1)
- Vertical Angles Exploration (2)
- Vertical Angles: Quick Discovery
- Vertical Angles Theorem
- Animation 1
- Transversal Intersects Parallel Lines
- Transversals, Parallel Lines, Angles: Protractor Version
- Corresponding Angles: Quick Investigation
- Congruent Corresponding Angles to Start? (Quick Investigation)
- Corresponding Angles and Parallel Lines
- Alternate Interior Angles: Quick Investigation
- Alternate Interior Angles and Parallel Lines
- Exploring Alternate Interior Angles (V2)
- Alternate Interior Angles Theorem (V3)
- Animation 16
- Alternate Exterior Angles: Quick Investigation
- Alternate Exterior Angles and Parallel Lines
- Exploring Alternate Exterior Angles (V2)
- Animation 39
- Animation 60
- Same-Side-Interior Angles: Quick Investigation
- Same Side Interior Angles and Parallel Lines
- Animation 29
- Same-Side-Exterior Angles: Quick Investigation
- Same Side Exterior Angles and Parallel Lines
- Animation 73
- Parallel Lines and Angle Measures (1)
- Parallel Lines and Angle Measures (2)
- Open Middle: Same-Side Interior or Exterior Angles
- Open Middle Challenge: Parallel Lines and Related Angles
- Solution to Parallel Lines & Angles Problem
- Interesting Coplanar Locations (1)
- A Special Theorem: Part 1 (V1)
- A Special Theorem: Part 2 (V1)
- A Special Theorem: Part 2 (V2)
- A Special Theorem: Part 2 (V3)
- Animation 57
- Perpendicular Bisector: Quick Recap
- A Special Theorem: Part 2 (V4)
- PBT (Part 1) - Quick
- PBT (Part 2) - Quick
- Plane Bisector: Quick Illustrator
- Where in This City? (1)
- CT Home Depots
- Where in NYC? (VA)
- Where in NYC? (VB)
- Where in NYC? (VC)
- Angle Bisector Theorem (Part 1)
- Another Special Theorem: Part 1 (V1)
- Another Special Theorem: Part 2 (V1)
- Another Special Theorem: Part 1 (V2)
- Animation 58
- Another Special Theorem: Part 1 (V3)
- Effortless Trisections
- Animation 134
- Parallel Lines Congruent Segments Theorem
- Parallel Lines Proportionality Theorem
- Animation 135
- Proof Prompt (A)
- Animation 128
- Proof Prompt (B)
- Animation 127
- Proof Prompt (C)
- Animation 131
- Proof Prompt (D)
- Animation 130
Triangles & Polygons
- Triangle Area Action! (V1)
- Triangle Area Action!!! (V2)
- Open Middle: Triangle Area Problem
- Animation 175
- Area of a Triangle (Discovery)
- 4 Triangles Action!!!
- Animation 179
- Triangle Angle Theorems
- Animation 171
- Animation 2
- Triangle Angle Theorems (V3)
- Triangle Angle Sum Theorem (V4)
- Open Middle: Triangle Angles
- Open Middle Triangle Angles Problem
- Open Middle Triangle Angle Sum Problem
- Open Middle Triangle Angle Sum Problem (V2)
- Triangle Angle Sum Theorem
- Obvious Corollary
- Animation 140
- Triangle Exterior Angle
- Animation 102
- Triangle: Exterior Angles
- Open Middle: Interior and Exterior Angles of Triangles
- Quadrilateral: Exterior Angles
- Pentagon: Exterior Angles
- Polygons: Exterior Angles
- Polygons: Exterior Angles - REVAMPED
- Exterior Angles (Revisited)
- Exterior Angles (Revisited) V2
- Lambourghini Turning Angles
- Exploring Polygon Angles: Triangle through Octagon
- Angles of a Right Triangle
- Animation 104
- Acute Angles of a Right Triangle
- Animation 129
- Animation 22
- Isosceles Triangle: Quick Discovery
- IST: Quick Discovery (Revamped)
- A Special Triangle & Its Properties (I)
- Isosceles Triangle Investigation
- Isosceles Triangle Theorem: Discovery Lab
- Animation 8
- Exploring Isosceles Triangles (Version A)
- Exploring Isosceles Triangles (VB)
- Converse of IST: Template
- Converse of IST (V1)
- One Special Triangle: Quick Investigation
- Animation 82
- Controlling Angles with Sliders: Ex. 14
- Animation 23
- Another Special Triangle and its Properties (II)
- Animation 27
- Converse of IST (II)
- Animation 84
- Isosceles Right Triangle: Quick Investigation
- Special Right Triangle (I)
- Animation 59
- Special Right Triangle (II)
- Another Special Right Triangle (Guided Discovery)
- Animation 42
- Special Line through Triangle V1 (Theorem Discovery)
- Special Line through Triangle V2 (Theorem Discovery)
- Triangle Midsegment Action!
- Animation 141
- Working With Midpoints: Ex. 8
- Midsegment of a Triangle
- Triangle Inequality: Open Middle Problem (V1)
- Triangle Inequality: Open Middle Problem (V2)
- Triangle Inequality: Discovery Lesson
- Triangle Side Possibilities? (V2)
- Triangle Inequality
- Triangle Inequality (II)
- Sliders & Circles Discovery: Ex. 13
- Inequalities in 1 Triangle
- Points of Concurrency: Investigation
- Lines Containing Altitudes of a Triangle (V1)
- Orthocenter Exploration
- Guess the Orthocenter!
- Circumcenter (& Questions)
- Circumcenter & Circumcircle Action!
- Making Perpendicular Bisectors: Ex. 9
- Guess the Circumcenter!
- Animation 28
- Midpoint of HYP
- Animation 46
- Incenter Exploration (A)
- Incenter Exploration (B)
- Incenter + Incircle Action (V2)!
- Incenter & Incircle Action!
- Constructing Angle Bisectors: Ex. 11
- Guess the Incenter!
- Animation 17
- Triangle: 3 Medians Investigation
- Triangle Medians: Quick Investigation
- Medians Centroid Theorem (Proof without Words)
- Medians and Centroid Dance
- Guess the Centroid!
- Animation 25
- Right Triangle Investigation
Parallelograms
- Parallelogram: Area
- Animation 202
- Parallelogram Construction Template & Discovery Lab
- Parallelogram Template (Scaffolded Discovery)
- Parallelogram: Theorem 1
- Animation 123
- Parallelogram: Theorem 2
- Animation 124
- Parallelogram: Theorem (3)
- Animation 125
- Parallelograms (I)
- Animation 75
- Animation 80
- Animation 6
- What Kind of Quadrilateral is This? (Part 1)
- What Kind of Quadrilateral is This? (Part 2)
- What Kind of Quadrilateral is This? (Part 3)
- What Kind of Quadrilateral is This? (Part 4)
- Special Quadrilateral: Theorem 1
- Animation 184
- Special Quadrilateral: Theorem 2
- Animation 185
- Special Quadrilateral: Theorem 3
- Animation 186
- Special Quadrilateral: Theorem 4
- Animation 187
- Congruent Opposite Sides of a Quadrilateral
- Quadrilateral With Opposite Angles Congruent
- What Kind of Quad?
- Quadrilateral Investigation (I)
- Rhombus Action!
- Animation 11
- Rhombus Construction Template
- Rhombus Template with Investigation Questions
- Rhombus Template (Scaffolded Discovery)
- Area of a Rhombus
- Rectangle Action!
- Animation 31
- Rectangle Construction Template
- Scaffolded Rectangle Template
- Rectangle Template with Investigation Questions
- Square Construction Template (1)
- Square Construction Template (2)
- Square Template (Scaffolded Investigation)
- Square Template with Investigation Questions
- Square Action!
- Animation 41
- Trapezoid Construction Template
- Trapezoids: Median Investiagtion
- Trapezoid Median (Midsegment) Action!
- Animation 67
- Trapezoid Median: 2 Discoveries
- Isosceles Trapezoid Action!
- Animation 64
- Animation 35
- Isosceles Trapezoid Construction Template
- Isosceles Trapezoid Template (Scaffolded Discovery)
- Isosceles Trapezoid Template
- Animation 49
- Obvious Trapezoid Theorem?
- Kite Action!
- Animation 26
- Kite Construction Template (2)
- Kite Template: Scaffolded Investigation
- Kite Template with Investigation Questions
- Quad Midpoints Action!
- Animation 52
- Quadrilateral Creation Templates
- Quadrilateral Creations from 2 Isosceles Triangles
Geometric constructions
- Congruent Segments Construction (I)
- Isosceles Triangle (Quick Construction Technique) V1
- Animation 199
- Equilateral Triangle Construction (Dynamic Illustration)
- Animation 201
- Congruent Angle: Construction
- Congruent Angle Construction Action!
- Animation 196
- Angle Bisector Construction Action!
- Animation 197
- Alternate Angle Bisector Construction
- Animation 117
- Angle Bisector: Construction
- Angle Bisector (Basic Exercise)
- Perpendicular Line: Construction 1
- Perpendicular Line: Construction 2
- Perpendicular Bisector: Construction
- Parallel Line: Constructions
- Congruent Triangle: Construction
- Rectangle Construction Exercise
- Rectangle Construction Exercise: Revamped (V1)
- Rectangle Construction Exercise: Revamped (V2)
- Rhombus Construction Exercise: V1
- Rhombus Construction Exercise: V2
- Other Constructions: 1
- Other Constructions: 2
- Centroid Construction Challenge #1
- Possible Solution for Centroid Challenge #1
- Centroid Construction Challenge #2
- Possible Solution for Centroid Construction Challenge #2
- Centroid Construction Challenge #3
- Possible solution to Centroid Construction Challenge #3
- Triangle Construction Challenge #1
- Possible solution to Triangle Construction Challenge #1
- Triangle Consruction Challenge #2
- Possible solution to Triangle Construction Challenge #2
- Triangle Construction Challenge #3
- Potential solution for Triangle Construction Challenge #3
- Geometric Mean Illustration
- Animation 211
- Geometric Mean: Construction (VA)
- Geometric Mean: Construction (VB)
Constructing Regular Polygons Inscribed in Circles
Other Geometry Resources