Note: I recommend that this page be printed out, so that the instructions are easier to follow.
In order to successfully complete a proof,
it is important to think of the definition and the construction
of a parallelogram.
In the following outline, I will provide the statements, you provide the reasons.
Prove: If a quadrilateral is a parallelogram, then the opposite angles are congruent.
Given: Parallelogram ABCD
Prove: Angle BAD is congruent to angle DCB and angle CBA is congruent to angle ADC.
If you have any questions while trying to complete this investigation, or suggestions that would be useful, especially for use at the high school level, please send e-mail to email@example.com.
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