# Geometry

Geometry: A Formal Introduction

Geometry: A Solid Foundation: Definitions, Postulates, and Theorems

Geometry: Circumference and Area: Pi Anyone?

Geometry: From One Theorem Comes Many

Geometry: How Does This Relate to the Unit Circle?

Geometry: How Many Midpoints Are There?

Geometry: How Many Shapes Can a Circle Have?

Geometry: Hyperbolic Geometry: Saddle Up!

Geometry: Let's All Fly a Kite!

Geometry: Non-Euclidean Geometry

Geometry: Opening Doors with Similar Triangles

Geometry: Parallel Lines and Supplementary Angles

Geometry: Parallel Segments and Segment Proportions

Geometry: Proof by Contradiction: The Advantage of Being Indirect

Geometry: Proofs About Alternate Angles

Geometry: Proofs About Quadrilaterals

Geometry: Proofs Involving Perpendicular Lines

Geometry: Properties of All Quadrilaterals

Geometry: Properties of Parallelograms

Geometry: Properties of Similar Triangles

Geometry: Properties of Trapezoids

Geometry: Proving Angles Are Congruent

Geometry: Proving Lines Are Parallel

Geometry: Relationships Proving Lines Are Parallel

Geometry: Proving Relationships Between Lines

Geometry: Proving Segment and Angle Relationships

Geometry: Proving Segments and Angles Are Congruent

Geometry: Putting Quadrilaterals in the Forefront

Geometry: Ratio, Proportion, and Geometric Means

Geometry: Size Matters, So Let's Measure

Geometry: Taking the Burden out of Proofs

Geometry: The Given Information: Use It or Lose It!

Geometry: The Importance of Being Direct

Geometry: The Law of Detachment

Geometry: The Most Popular Parallelograms

Geometry: The Next Dimension: Surfaces and Solids

Geometry: The Pythagorean Theorem

Geometry: The Unit Circle and Trigonometry