The modules are written for teachers. The central role of construction is explained and many examples of constructions are presented. This module relates to Module 9: Measurement and Geometry: introduction to plane geometry - teacher guide, Module 20: Measurement and Geometry: parallelograms and rectangles - teacher guide, Module 21: Measurement and Geometry: rhombuses, kites and trapezia - teacher guide and Module 14: Measurement and Geometry: congruence - teacher guide.