Copy of Properties of a Parallelogram
Use this applet to discover properties of every parallelogram.
You will not use the "show slopes" button because we are not interested in slopes.
Click on any vertex of the quadrilateral to change its size to help you answer the questions below.
Click on the "show diagonals" button. What is true of segments DE and EB?
What is true of segments AE and EC?
Is segment DE congruent to segment AE? Explain your answer.
Uncheck the "show diagonals" button and click on the "show segment lengths" button. Which pair of segments are congruent?
Move the sides around until all sides have an equal length. Is the resulting parallelogram a square? Explain.
If the resulting parallelogram is not a square, what would it be?
Uncheck the "show segment lengths" button. Click on the angles button. Which angle pairs are congruent?
Using your calculator add angles A and angle D together (don't forget to include decimals). What is your answer?