Polygons used to construct three-dimensional shapes are invaluable manipulatives. These colorful plastic shapes can be quickly and easily connected together at the edges to form hinges. The hinges allow various polygons (nets) to fold into three dimensional shapes providing a concrete understanding of mathematical concepts. Each durable plastic isosceles triangle shape also has a isosceles triangle cutout to allow internal viewing of angles, edges and vertices for spatial comprehension. The cutouts also provide finger placement for easy construction and breakdown. PolyConstructo® is easy to handle for young children, yet also designed for middle and secondary grade curriculum. PolyConstructo® is interchangeable with other popular polygonal construction manipulatives. Set of 60 includes 12-page teacher's guide with vocabulary and basic activities.