In high school mathematics teaching, solid geometry has always been one of the important tasks in the teaching process of high school mathematics geometry, and it is also one of the difficulties for high school students to learn. For solid geometry, the expansion and promotion from plane thinking in junior high school to three-dimensional space in senior high school is an important leap in students' cognition, so students often lack the ability of spatial imagination and the development of spatial perception and graphic cognition in the learning process, so teachers need to establish suitable scaffolding for students.

At present, in primary and secondary schools in Chinese mainland, teachers are used to teaching with geometric sketchpad. Geometric sketchpad is designed to teach plane geometry, and most of them are mainly drawn with rulers. The three-dimensional representation of graphics in solid geometry is its shortcoming. In the past six months, the author has studied and studied a new dynamic mathematics software-Geogebra, and found that it can completely replace the geometry drawing board, covering almost all mathematics knowledge from kindergarten to higher education.

Introduction to GeoGebra Software: GeoGebra (Geometry+Algebra, hereinafter referred to as GGB) is a free and easy-to-operate dynamic mathematics software developed by Professor Markus Hohenwarter of Atlanta University in Florida and his team in 2002. Up to now, GGB has been used in more than 50 languages, widely used in nearly 200 countries around the world, and won more than ten awards internationally.

At present, it is widely used in Taiwan Province Province and Hongkong, and the mainland is still in the development stage, but many teachers know about it. 20 1 1 In May, under the leadership of Professor Cao Yiming, China GeoGebra Research Institute was established in Beijing Normal University, followed by Tianjin Normal University and South Normal University, which provided a broad platform for GGB's research and development in Chinese mainland.