# Parallelogram Template

- Author:
- Luke Cioffi, Tim Brzezinski

- Topic:
- Parallelogram

Parallelogram Lab

Use GeoGebra to complete the following investigation.

**BE SURE to move the vertices and sides of this parallelogram around after completing each step in order to help you make more informed conjectures**: 1) Measure and display the lengths of all 4 sides. What, if anything, do you notice? Describe in detail. 2) Construct the midpoint of segment AC (even though you haven’t constructed segment AC yet.) Label this point “E”. 3) Construct segments with lengths AE, BE, CE, & DE. Then measure and display their lengths. What do you notice? 4) Measure & display the measures of the following angles: Angle BAE, EAD, ADE, EDC, DCE, ECB, CBE, EBA. What do you notice? 5) Measure display just one of the four angles you see with vertex E. Questions to answer/consider: 1) Are opposite sides of a parallelogram congruent? 2) Are opposite angles (ENTIRE ANGLES—like angle DAB & angle DCB) of a parallelogram congruent? 3) Do the diagonals of a parallelogram bisect EACH OTHER? 4) Does a diagonal of an parallelogram bisect a pair of opposite angles? If so, how many diagonals do this? 5) Are the diagonals of a parallelogram perpendicular? 6) Are the diagonals of a parallelogram congruent?