The applet below contains a quadrilateral that ALWAYS remains a parallelogram. The purpose of this applet is to help you understand many of the geometric properties a parallelogram has. Some of these properties are unique and only hold true for a parallelogram (and not just any quadrilateral). The questions you need to answer are displayed below this applet.
1) Are OPPOSITE sides of a parallelogram congruent?
2) Are OPPOSITE sides of a parallelogram [u][b]paralle[/b][/u][b][u]l[/u][/b]?
3) Are OPPOSITE angles of a parallelogram congruent?
4) Do you notice anything about CONSECUTIVE angles?
5) Find the sum of [math]\angle A+\angle B=[/math]
6) Find the sum of [math]\angle B+\angle C=[/math]
7) Find the sum of [math]\angle C+\angle D=[/math]
8) Find the sum of [math]\angle D+\angle A=[/math]
[b]The consecutive angles (2 angles in a row) are Supplementary![/b]
9) Are the diagonals of a parallelogram congruent?
10) Are the diagonals of a parallelogram perpendicular?[br]
11) Do the diagonals of a parallelogram bisect each other?
12) Does a diagonal of a parallelogram bisect a pair of opposite angles?
If so, how many diagonals do?
[b][color=#9900ff][size=150][size=200]Write down in your Notes any important property you observe to be true!![/size][/size][/color][/b]