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This page is about using principles and theorems to solve steps in geometry problems, and to justify those steps.

 

30-60-90 Triangle Part 1:

Principles 1,2,3:

Principles 5,6,7:

Principle 8 (Transversals):

Principle 9 (Right Triangle) Example 1:

Principle 9 (Right Triangle) Example 2:

Principle 11 (Triangle):

Principle 12:

Principle 13:

Principle 14:

Principle 16 (Trapezoid) Example 1:

Principle 16 (Trapezoid) Example 2: