This activity could be used as an assessment after a unit on special quadrilaterals. Students are given an unknown quadrilateral constructed with a given diagonal property. By dragging the vertices of the quadrilateral, students conjecture as to the names of the quadrilaterals that can be constructed with the given diagonal property. Students support their conjecture by taking appropriate measurements. As a result of this activity, students should have a classification of quadrilaterals based up.

The associated .tns file should be downloaded onto the student handhelds. If you choose to have students type their conjectures into the document, you should be prepared to have students download their completed documents to your computer.

You may also choose to have your students write their conjectures and support on paper; you should still check their documents for their support.