Chapter 2: An ancient theorem and a modern question

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Preliminaries

• Know how to visually represent addition, subtraction, multiplication, and powers
  • Rethinking Arithmetic: A Visual Guide
• Know what squares (powers of two) and square roots are
  • Squares and Square Roots
• Know what logarithms are
  • Logarithms, Explained
• Know what an equation and the solution of an equation is (note that an equation can have more than one solution!)
• Now tie it all together
  • Triangle of Power
• And quick a introduction to radians
  • What are radians? Simply explained

Essential

• An additcting puzzle game where you do Euclidian constructions
  • Euclidia
• An interactive animated version of a proof of the Pythagorean Theorem
  • Pythagorean Theorem Proof by Community Contributor @TimAlex
• Hyperbolic geometry
  • Playing Sports in Hyperbolic Space
  • Ditching the Fifth Axiom

Recommended

• Understanding fractional powers
  • What Do Fractional Exponents Mean?
• A more in-depth description of the logarithms and exponents with applications
  • Logarithm Fundamentals
• A spot of linear algebra
  • The Essence of Linear Algebra

Further Exploration

• To understand what geometry really is
  • The Four Pillars of Geometry by John Stillwell
• A guide through Euclid's Elements
  • Euclid’s Elements
• A more in depth introduction to linear algebra
  • Linear Algebra Done Right by Sheldon Axler