Given: Ray DR bisects angle CDA, angle 3 is congruent to angle 1, and angle 4 is congruent to angle 2 Prove: Angle 3 is congruent to angle 4
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Tutor.com
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Shows definitions of parallelograms and their angles. Also shows two sample proofs.
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Regents Prep
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Triangle proofs. Questions & Answer keys.
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West irondequoit Centeral School District
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Very comprehensive site concerning mathematical proofs. Contains excellent examples and interactive exercises.
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Cut The Knot
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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A selection of answers from the Dr. Math archives.
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Ask Dr. Math
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In-depth review of how to write a proof, with examples and definitions along the way.
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Proofs
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Interactive quiz on properties
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Math Warehouse
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This provides 4 to 5 congruent triangle proofs for more complex situations.
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Analyze Math
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