Welcome to the

Geometry Homepage

Logic

• Sentences, Statements and Truth Values (2.1)
• Conjunctions (2.2)
• Disjunctions (2.3)
• Conditionals (2.4)
• Inverses, Converses and Contrapositives (2.5)
• Biconditionals (2.6)
• Truth Tables, Tautologies and Logically Equivalent Statements (A1.4)
• The Laws of Logic (2.7)
• Law of Modus Tollens (A1.7)
• Invalid Arguments (A1.8)
• Chain Rule (A1.9)
• Drawing Conclusions (2.8)
• Logic Proofs (A1.13)

Introduction and Definitions of Geometric Terms

• Undefined Terms (1.1)
• Points, Lines and Planes (11.1)
• Perpendicular Lines and Planes (11.2)
• Parallel Lines and Planes (11.3)
• The Real Numbers and their Properties (1.2)
• Definitions, Lines and Line Segments (1.3)
• Midpoints and Bisectors (1.4)
• Rays and Angles (1.5)
• More Angle Definitions (1.6)
• Triangles (1.7)
• The Sum of the Measures of the Angles of a Triangle ( 9.4)