Do you or your students need a vocabulary review? Here are two videos featured on the Bridges Blog http://bridges1.mathlearningcenter.org/resources/blog
“The Polygon Movie” features 3rd grade students talking about different polygons http://www.youtube.com/watch?v=_bkJZEssUv0
“Know Your Quadrilaterals” is a song/video that shows how different quadrilaterals are related http://www.youtube.com/watch?v=rXZcYHVwkqI&feature=share
Scroll down this page http://www.alyciazimmerman.com/math-charts.html for more visuals about 2-dimensional shapes.