[b]Manipulate the corners of the quadrilaterals (all the blue corners can change the shape).[/b]

[color=#0a971e]Which ones are squares?[/color][br][color=#1551b5]How do you know?[br]What are the names of the other shapes?[br]What properties do they have?[/color][br][br][color=#0a971e]Challenge question: can you use geogebra to recreate this?[br]What key properties do you need to use for each shapes?[/color]

A quadrilateral is dissected by a line joining the mid-points of one pair of opposite sides, and the perpendiculars to this line from the mid-points of the other pair of opposite sides.[br][br]What shape can you get from this dissection?[br][br]Try another similar dissection for triangles at http://www.geogebratube.org/student/m3589 .