The document contains links to articles about contextual teaching and learning models, the van Hiele theory for teaching geometry, and cooperative learning approaches. Specifically, the links discuss a contextual learning model called REACT, applying the van Hiele theory to make geometry lessons more appropriate to students' developmental levels, and using cooperative learning strategies to encourage collaboration between students.

1. jurnal-online.um.ac.id/article/do/detail-article/1/31/921
http://mediafunia.blogspot.com/2013/02/model-pembelajaran-kontekstual-react.html
http://abdussakir.wordpress.com/2011/02/09/pembelajaran-geometri-sesuai-teori-
van-hiele-lengkap/
http://edmymatheducation.blogspot.com/2011/06/contextual-teaching-and-learning-
with.html
http://wytr33.wordpress.com/2012/12/25/cooperative-learning-pembelajaran-
kooperatif/