### 2: Reasoning in Geometry

#### 2.5: Angle Relationships

Investigating Angle Theorems - Activity A

Investigating Angle Theorems - Activity B

### 3: Using tools of Geometry

#### 3.1: Duplicating Segments and Angles

Constructing Congruent Segments and Angles

#### 3.3: Constructing Perpendiculars to a Line

Construct Parallel and Perpendicular Lines

#### 3.5: Constructing Parallel Lines

Construct Parallel and Perpendicular Lines

#### 3.7: Constructing Points of Concurrency

Concurrent Lines, Medians, and Altitudes

### 4: Discovering and proving Triangle Properties

#### 4.1: Triangle Sum Conjecture

Triangle Angle Sum - Activity A

#### 4.2: Properties of Isosceles Triangles

Isosceles and Equilateral Triangles

#### 4.3: Triangle Inequalities

Triangle Inequalities

#### 4.4: Are There Congruence Shortcuts?

Proving Triangles Congruent

#### 4.5: Are There Other Congruence Shortcuts?

Proving Triangles Congruent

#### 4.8: Proving Special Triangle Conjectures

Bisectors in Triangles

Concurrent Lines, Medians, and Altitudes

### 5: Discovering and Proving Polygon Properties

#### 5.1: Polygon Sum Conjecture

Polygon Angle Sum - Activity A

#### 5.3: Kite and Trapezoid Properties

Classifying Quadrilaterals - Activity B

#### 5.5: Properties of Parallelograms

Parallelogram Conditions

#### 5.6: Properties of Special Parallelograms

Special Quadrilaterals

### 6: Discovering and Proving Circle Properties

#### 6.2: Chord Properties

Chords and Arcs

#### 6.3: Arcs and Angles

Inscribing Angles

#### 6.5: The Circumference/Diameter Ratio

Circle: Circumference and Area

### 7: Transformations and Tessellations

#### 7.1: Transformations and Symmetry

Reflections

Rotations, Reflections and Translations

Translations

### 8: Areas

#### 8.1: Areas of Rectangles and Parallelograms

Area of Parallelograms - Activity B

Rectangle: Perimeter and Area

#### 8.2: Areas of Triangles, trapezoids, and Kites

Area of Parallelograms - Activity A

#### 8.5: Areas of Circles

Circle: Circumference and Area

Perimeter, Circumference, and Area - Activity A

#### 8.7: Surface Area

Surface and Lateral Area of Prisms and Cylinders

Surface and Lateral Area of Pyramids and Cones

### 9: The Pythagorean Theorem

#### 9.1: The Theorem of Pythagoras

Geoboard: The Pythagorean Theorem

Pythagorean Theorem - Activity A

#### 9.2: The Converse of the Pythagorean Theorem

Pythagorean Theorem - Activity B

#### 9.5: Distance in Coordinae Geometry

Distance Formula - Activity A

### 10: Volume

#### 10.2: Volume of Prisms and Cylinders

Prisms and Cylinders - Activity B

#### 10.3: Volume of Pyramids and Cones

Pyramids and Cones - Activity B

#### 10.5: Displacement and Density

Archimedes' Principle

Determining Density via Water Displacement

### 11: Similarity

#### 11.1: Similar Polygons

Dilations

Similar Figures - Activity A

Similar Polygons

Similarity in Right Triangles

#### 11.4: Corresponding Parts of Similar Triangles

Perimeters and Areas of Similar Figures

#### 11.5: Proportions with Area

Perimeters and Areas of Similar Figures