Directions: Determine the most specific name for each mystery quadrilateral (parallelogram, rectangle, square, rhombus, trapezoid, or quadrilateral). You must provide reasoning how you determine each mystery quadrilateral by writing a short paragraph (see example below). Support your answer with the measurements you have taken. Make sure that you list all of the important measurements on your paper. Also be sure to state why the quadrilateral could NOT be any other name.

Note: If lines have the same slope, then they are parallel. To measure the slope, click on the segment and go to the Measure menu and select slope. Make sure you compare the slopes of opposite sides to determine if lines are parallel.

EXAMPLE

Sample Solution: I think this quadrilateral is a RHOMBUS because it has four equal sides and does not have right angles. If all four angles were right angles, then the quadrilateral would be a square. If all four sides were not equal, and only two pairs of sides were equal, then the quadrilateral would be a parallelogram.

Getting Started...

v     Open (double click) your computer's Hard Drive and find the folder titled mystery. Click on the file quad1.gsp to start.

v     Once the file opens, go to DISPLAY -> PREFERENCES and make sure that the precision for all measurements is in HUNDREDTHS and that the distances are given in CENTIMETERS.

Solution Paragraph.

*** To OPEN a new quadrilateral, FILE, OPEN and DOUBLE CLICK on the new file ***

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