Polydron School Geometry Set 10-3020 Use this set to cover all the activities in the ‘Mathematics with Polydron’ resource book. Polystyrene insert allows the teacher to make sure everything is packed back into the tray. This 266 piece set contains: 20 Hexagons, 30 Squares, 80 Equilateral Triangles, 12 Pentagons, 40 Right Angle Triangles, 60 Isosceles Triangles, 24 Root 2 Triangles, 2 Protractors and an Exploring booklet. Age 4+. Each square piece measures 7.5 x 7.5cm.