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A helpful scientific calculator that runs in your web browser window.

Interactive quiz on properties

This provides 4 to 5 congruent triangle proofs for more complex situations.

This site outlines the theorems about parallelograms with proofs to these theorems.

Very comprehensive site concerning mathematical proofs. Contains excellent examples and interactive exercises.

In-depth review of how to write a proof, with examples and definitions along the way.

list of common geometry postulates and theorems