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Interactive Lessons
Trigonometry

The Law of Sines

30-60-90 Triangles

45-45- Right Triangles

Transformations
Introducing a Translation

Using Matrices to Transform a Figure

Translation Worksheet

Introduction of Transformations

Similarity

Circles
Building Understanding for the Equation of a Circle

Triangles
How Many Parts Guarantee One Triangle?

3D

# Drawing Three Dimensional Boxes with Isosmetric Dot Paper

FREE

Area/Volume

Making Nets for  a Rectangular Box and Relational Pyramid

Exploring Surface Area and Volume

# Constant Perimeter and Changing Area of a Rectangle -GSP

Area of Irregular Regions

Points of Concurrency

# Points of Concurrency - GSP

Transformations

Discovering Patterns In Transformations with a Geoboard

Discovering Properties of a Translation - SN

FREE
Student Directed Lessons and Teacher-Led Lessons on Transformations

MP4 Video on How Animators Use Transformational Geometry

# Introduction to Transformations

Creating Transformations on the TI84

Similarity
Create an Enlargement, Reduction, or Distortion of a Cartoon

FREE

That's a Really Big Dog!
Discovering Ways Triangles are Similar

FREE

Finding the Height of a Flagpole

How Many Squares Can You Find on an 11 x 11 Geoboard?

Triangles

Parallel and Perpendicular Lines

Parallel Lines - An Investigation

Distance, Pythagorean Theorem, Midpoints

Tangrams

Thinking about Parts of the Whole Using Tangram Pieces

Ten High School Activities for Tangrams

Making a Set of Tangrams - Folding and Cutting Directions

Circles

Finding Arc Length of a Circle

Integrating Writing
Write a Children's Book Cartoons Rhymes

Tangram Stories How To Construct End of Year

Wanted Posters Transformations and Tessellations Writing Definitions for Supplementary and Complementary Angles

Other Forms of Writing   Directions for Making the Booklet

Assessment Ideas
Assessment Ideas for Discovering Geometry

Student Mobiles

Miscellaneous

Pascal's Triangle Powerpoint

FREE

Finding and Analyzing Artifacts Origami Write a Poem

Pop Up Cards (Fractals)   Star Polygons

Star Polygon Data Chart

Scoring Rubric