
Interactive
Lessons 

Trigonometry 
Solving Right Triangles

Introducing
3 Trigonometric Ratios

Exploring the Tangent Ratio




Introduction to Trigonometry

The Law of Cosines

The Law of Sines




Special Right Triangle Drawings

306090 Triangles

4545
Right Triangles




Transformations 
Introducing a Translation

Using Matrices to Transform a Figure

Line and Rotational Symmetry




Translation Worksheet








Introduction of Transformations




Similarity 
Geoboard/Pattern Block Similarity

Dividing a Line Segment Proportionally on a Coordinate Grid

Using Proportions to Solve Scale Drawings in Geometry




Exploring Properties of a Dilation

Similarity with the Side Splitter Theorem and the Angle Bisector Theorem

Developing an Understanding for the Geometric Mean




Circles 

Building Understanding for the Equation of a Circle





Quadrilaterals 

Discovering Properties of Quadrilaterals





Triangles 

How Many Parts Guarantee One Triangle?





3D 

FREE


Area/Volume 
Task Cards
for Building Polyhedra

Problems on the Volume of a Prism

Surface Area of a Square Pyramid




Drawing 3D Models

Build a Model  Volume of a Square Prism and Volume of a Square Pyramid

Making Nets for a Rectangular Box and Relational Pyramid




Exploring
Surface Area and Volume

Maximum Volume  How is That Box Changing?





Area of a Triangle on a Geoboard

Discovering the Formula for the Area of a Circle

Exploration with Area and Perimeter, Student Activity Sheet, FollowUp
Activity and Student Grids




Using Limits to Find the Area of a Circle

Six Station Investigation of the Area of a Rectangle, Parallelogram, and
Trapezoid

Discovering Pick's Theorem




Height  Area  Volume

Understanding How to Find the Area of a Trapezoid

Area of Irregular Regions 



Points of Concurrency 

Points of Concurrency  An Exploration







Transformations 
Discovering Patterns In Transformations with a Geoboard
10 Lessons

Discovering Patterns In Transformations with a Geoboard Part I  3
Lessons

Discovering Patterns In Transformations with a Geoboard Part II  3
Lessons




Discovering Patterns In Transformations with a Geoboard Part III  4
Lessons

Discovering Properties of a Translation  SN
FREE 
Student Directed Lessons
and TeacherLed Lessons on Transformations




MP4 Video on How Animators Use Transformational Geometry 

Creating
Transformations on the TI84

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

Exploring Similarity
FREE

What are Similar Polygons




Understanding a Dilation

Creating Similar Figures
Student Activity, Graph Paper, and Answers

How Large is that Tower?




That's a Really Big Dog!

Discovering Ways Triangles are Similar
FREE

Finding the Height of a Flagpole





Studying the Properties of Figures Created through a Dilation


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

Properties of Quadrilaterals

Properties of a Parallelogram




Properties of a Parallelogram


Exterior angles of a polygon




Triangles 



SSA Investigation

Exploring Isosceles Triangles

Understanding the 3 Trigonometric Ratios




Parallel and Perpendicular Lines 
Slopes of Parallel and Perpendicular Lines

Parallel Lines  An Investigation

Exploring the Sum of the Angles of a Polygon







Distance, Pythagorean Theorem, Midpoints 
Developing an Understanding for the Midpoint and Distance on a Plane

Finding a Midpoint of a Segment

Special Right Triangles




I Have... Who Has...Cards Pythagorean Theorem

Finding the Length of a Hypotenuse

Pythagorean Theorem  Discovery with Area




Understanding the Pythagorean Theorem


Visualizing the Pythagorean Theorem










Tangrams 
Ten Middle School Activities for 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 
5 Investigations about Tangents to a Circle

Folding a Circle  A Beginning Activity on Circles
Video

Finding Arc Length of a Circle




Investigating Line and Line Segments
Associated with a Circle


Tangent Segments 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
Chapter 0
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Alternate Chapter 7
Chapter 8
Chapter 101112 
Alternative Take Home Test on
Circles
Scoring Rubric
Sample Student Test
Sample Student Test 
Construction Booklet
Scoring
Rubric
Student Sample 



Student Mobiles 

Student Portfolio On
Transformations and Tessellations
Student
Sample 



Miscellaneous 
Pascal's
Triangle Through Polygons

Pascal's Triangle
Powerpoint
FREE 
Golden Ratio and Nautilus Shell


Finding and Analyzing Artifacts 
Origami 
Write a Poem 



Pop Up Cards (Fractals) 

Star Polygons
Star Polygon Data Chart
Scoring
Rubric 































