UPYGEO
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  • Semester 1
    • Level 1 - Transformations >
      • 1.1 Points, Lines, and Shapes
      • 1.2 Transformations
      • 1.3 Translations
      • 1.4 Reflections
      • 1.5 Rotations
      • 1.6 Dilations
      • 1.7 - Symmetry
      • Level 1 Study Guide
    • Level 2 - Congruent Triangles >
      • 2.1 Triangle Sum Theorem
      • 2.2 SSS and SAS Congruence
      • 2.3 ASA, AAS and HL Congruence
      • 2.4 Essential Proof Vocabulary
      • 2.5 Triangle Proofs
      • 2.6 CPCTC
      • Study Guide for Level 2 Test
    • Level 3 - Parallel Lines >
      • 3.1 Vertical Angles and Linear Pairs
      • 3.2 Parallel Lines and Transversals
      • 3.3 Proving Lines are Parallel
      • 3.4 Advanced Proving Lines are Parallel
      • 3.5 - Proofs with Parallel Lines
      • Level 3 Study Guide
    • Level 4 - Parallelograms >
      • 4.1 - Properties of Parallelograms
      • 4.2. - Properties of a Rhombus
      • 4.3 - Properties of Rectangles and Squares
      • 4.4 - Proving Triangles Congruent with Parallelograms
      • Level 4 Study Guide
    • Level 5 - Similar Triangles >
      • 5.1 - Similar Triangles
      • 5.2 Side Splitter Theorem
      • 5.3 - Proving Similarity
      • 5.4 Right Triangle Similarity
      • 5.5 Similarity Transformations
      • Study Guide for Level 5 Test
      • Khan Academy Extra Credit
    • Level 6 - Trigonometry >
      • 6.1 - Trigonometric Ratio's
      • 6.2 - Finding Missing Sides with Trig
      • 6.3 - Inverse Trig Functions
      • 6.4 - Cofunctions
      • Level 6 Study Guide
    • Office Hours >
      • Proofs Practice
  • Semester 2
    • Level 7 - Coordinate Geometry >
      • 7.1 Slopes of Lines
      • 7.2 Graphing Lines
      • 7.3 Parallel and Perpendicular Lines
      • 7.4 Equations of Parallel and Perpendicular Lines
      • 7.5 Dilating Lines
      • Study Guide for Level 7 Test
    • Level 8 - Applications of Coordinate Geometry >
      • 8.1 - Distance and Midpoint Formula
      • 8.2 Proving Right Triangles on Coordinate Plane
      • 8.3 Proving Parallelograms on Coordinate Plane
      • 8.4 Proving Special Parallelogram on the Coordinate Plane
      • 8.5 Partitioning Line Segments
      • Study Guide for Level 8
    • Level 9 - Circles >
      • 9.1 - Central Angles and Arcs
      • 9.2 Angles Inside and Outside of Circles
      • 9.3 Area and Circumference
      • 9.4 Area of Sectors
      • 9.5 Equations of Circles
      • 9.6 Writing Equations of Circles
      • Level 9 Study Guide and test
    • Level 10 - 3D Figures >
      • 10.1 - Area of Shapes
      • 10.2 - Cross Sections of 3D Shapes
      • 10.3 - Volume of Prisms and Cylinders
      • 10.4 - Volume of Pyramids and Cones
      • 10.5 - Volume of Spheres
      • 10.6 - Applications of Volume
      • 10.7 - Level 10 Study Guide
  • Geometry Regents Prep
    • Geometry Regents Notes
    • Constructions >
      • Constructing Perpendicular Bisectors
      • Constructing Equilateral Triangles
      • Constructing Squares
      • Constructing Parallel Lines
      • Construction Dilations
      • Constructing Rotations
    • Regents Review Homework >
      • Regents Review - Homework 1
      • Regents Review - Homework 2
      • Regents Review - Homework 3
      • Regents Review - Homework 4
      • Regents Review - Homework 5
      • Regents Review - Homework 6
    • Past Regents Exams >
      • Online Practice Exams >
        • Practice Geometry Exam 1
        • Practice Geometry Exam 2
      • June 2015 Geometry Regents
      • August 2015 Geometry Regents
      • January 2016 Geometry Regents
      • June 2016 Geometry Regents
      • August 2016 Geometry Regents
      • January 2017 Geometry Regents
      • January 2018 Geometry Regents
  • Classroom Resources
    • Coding Club Survey
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2.1 Interior Angles of Triangles

yes, I know it says 3.1 in the video. I changed the lesson from last year. Please don't come up to me and say "Mr. Siegel, the lesson says 3.1 in the video but on the sheet it says 2.1." Please. I already know. This doesn't make you cool telling me this.

Lesson Packets

3.1_interior_angles_of_triangles.pdf
File Size: 152 kb
File Type: pdf
Download File

Answer Key

3.1_answer_key.pdf
File Size: 98 kb
File Type: pdf
Download File

Alternative Mastery
​Khan Academy - Isosceles Triangles

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Class code: CSDYD9

Khan Academy

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  • Home
  • Semester 1
    • Level 1 - Transformations >
      • 1.1 Points, Lines, and Shapes
      • 1.2 Transformations
      • 1.3 Translations
      • 1.4 Reflections
      • 1.5 Rotations
      • 1.6 Dilations
      • 1.7 - Symmetry
      • Level 1 Study Guide
    • Level 2 - Congruent Triangles >
      • 2.1 Triangle Sum Theorem
      • 2.2 SSS and SAS Congruence
      • 2.3 ASA, AAS and HL Congruence
      • 2.4 Essential Proof Vocabulary
      • 2.5 Triangle Proofs
      • 2.6 CPCTC
      • Study Guide for Level 2 Test
    • Level 3 - Parallel Lines >
      • 3.1 Vertical Angles and Linear Pairs
      • 3.2 Parallel Lines and Transversals
      • 3.3 Proving Lines are Parallel
      • 3.4 Advanced Proving Lines are Parallel
      • 3.5 - Proofs with Parallel Lines
      • Level 3 Study Guide
    • Level 4 - Parallelograms >
      • 4.1 - Properties of Parallelograms
      • 4.2. - Properties of a Rhombus
      • 4.3 - Properties of Rectangles and Squares
      • 4.4 - Proving Triangles Congruent with Parallelograms
      • Level 4 Study Guide
    • Level 5 - Similar Triangles >
      • 5.1 - Similar Triangles
      • 5.2 Side Splitter Theorem
      • 5.3 - Proving Similarity
      • 5.4 Right Triangle Similarity
      • 5.5 Similarity Transformations
      • Study Guide for Level 5 Test
      • Khan Academy Extra Credit
    • Level 6 - Trigonometry >
      • 6.1 - Trigonometric Ratio's
      • 6.2 - Finding Missing Sides with Trig
      • 6.3 - Inverse Trig Functions
      • 6.4 - Cofunctions
      • Level 6 Study Guide
    • Office Hours >
      • Proofs Practice
  • Semester 2
    • Level 7 - Coordinate Geometry >
      • 7.1 Slopes of Lines
      • 7.2 Graphing Lines
      • 7.3 Parallel and Perpendicular Lines
      • 7.4 Equations of Parallel and Perpendicular Lines
      • 7.5 Dilating Lines
      • Study Guide for Level 7 Test
    • Level 8 - Applications of Coordinate Geometry >
      • 8.1 - Distance and Midpoint Formula
      • 8.2 Proving Right Triangles on Coordinate Plane
      • 8.3 Proving Parallelograms on Coordinate Plane
      • 8.4 Proving Special Parallelogram on the Coordinate Plane
      • 8.5 Partitioning Line Segments
      • Study Guide for Level 8
    • Level 9 - Circles >
      • 9.1 - Central Angles and Arcs
      • 9.2 Angles Inside and Outside of Circles
      • 9.3 Area and Circumference
      • 9.4 Area of Sectors
      • 9.5 Equations of Circles
      • 9.6 Writing Equations of Circles
      • Level 9 Study Guide and test
    • Level 10 - 3D Figures >
      • 10.1 - Area of Shapes
      • 10.2 - Cross Sections of 3D Shapes
      • 10.3 - Volume of Prisms and Cylinders
      • 10.4 - Volume of Pyramids and Cones
      • 10.5 - Volume of Spheres
      • 10.6 - Applications of Volume
      • 10.7 - Level 10 Study Guide
  • Geometry Regents Prep
    • Geometry Regents Notes
    • Constructions >
      • Constructing Perpendicular Bisectors
      • Constructing Equilateral Triangles
      • Constructing Squares
      • Constructing Parallel Lines
      • Construction Dilations
      • Constructing Rotations
    • Regents Review Homework >
      • Regents Review - Homework 1
      • Regents Review - Homework 2
      • Regents Review - Homework 3
      • Regents Review - Homework 4
      • Regents Review - Homework 5
      • Regents Review - Homework 6
    • Past Regents Exams >
      • Online Practice Exams >
        • Practice Geometry Exam 1
        • Practice Geometry Exam 2
      • June 2015 Geometry Regents
      • August 2015 Geometry Regents
      • January 2016 Geometry Regents
      • June 2016 Geometry Regents
      • August 2016 Geometry Regents
      • January 2017 Geometry Regents
      • January 2018 Geometry Regents
  • Classroom Resources
    • Coding Club Survey
    • Scavenger Hunt
    • Constructions
    • Learning To Learn
    • Contact Your Teacher
    • Grading Policy
    • SItes You Will Need
    • Mastery Checklists
    • Flipped Mastery Resources