About this Book (4S1)
My Acknowledgments to these GeoGebra Authors
Hannu Korhonen's 'geolaudan neliöt' is one of my favorite geoboards for carrying out classroom activities. Nevertheless he has set it as a private app. To respect his choice, a similar app written by him (viz. 'n x n -geolauta') is enclosed in this book.
The construction by Anthony Or - 'Drawing quadrilaterals on the grid/pinboard' is also my favorite. Its Chinese version named '方格紙上畫四邊形' is also available.
In compare with GeoBoard/PinBoard, not much is found for GeoStrips. Both 'http://ggbm.at/ncykVxTJ' (Antthony Or) and 'http://ggbm.at/d5BkmARK' (Arthur Lee) are not written for this purpose. Hence my simple one is inserted.
For the theme on 'Classifying and Identifying Quadrilaterals', tzunfung/Jack D. Gittinger and Anthony's apps are selected for class activities.
Being an origami lover, I enjoy much in reading chris cambré's GGbook 'http://ggbm.at/NJ3EKuyb' on 'Folding Paper, Doing Geometry Figures'.
This book can hardly be complied without the efforts of these authors.
About the Teaching Content
Considering the average cognitive development of pupils at primary 4, I prefer to introduce the concept of kite, polygon, regular polygon and diagonal as well.
Please be reminded to build up pupils' habit of recording their geoboard/pinboard activities in the worksheet provided. Mathematical notations should be introduced and brief description in words are helpful.
![[size=85]first edition 2018/10/12
revised on 2018/11/29[/size]](https://www.geogebra.org/resource/yu9n9bqp/PxoKs3gIuXGUAcNE/material-yu9n9bqp.png)