Free shipping on everything all the time. See details

Account and More
Textbook Resources

# Web Links for Geometry, 4th ed.

## Chapter 3: Parallel and Perpendicular Lines

### 3.6 Triangle Angle Sum Theorem

• Illuminations: Adding it All Up—Students use paper and pencil as well as dynamic software to study convex and concave polygons and their interior angle measures

## Chapter 4: Congruent Triangles

### 4.4 Congruence Theorems

• Illuminations: Pieces of Proof—Excellent activity as student begin to prove triangles congruent by identifying properties from a diagram and applying postulates and theorems to form a proof

## Chapter 7: Area

### 7.5 Areas of Regular Polygons

• Illuminations: Pinwheels—Origami style parallelograms and octagons are formed to study angle measure, side lengths and area of polygons

## Chapter 11: Surface Area and Volume

### 11.2 Tetrahedral Kites

• Illuminations: Tetrahedral Kites—Detailed description of an end of class project where students build a three dimensional figure made of straws and tissue paper

### 11.3 Surface Areas of Prisms and Cylinders

• Illuminations: Soda Cans—Students determine the most efficient way to create a six- or twelve-pack of soda in a real-life application of geometry