Geometricalfeature in outspread (10pcs）

The geometric feature is designed for the teaching focus on diffculty in geometryin middle schools, and is designed for the needs of teachers teaching andstudents learning,including ten types:geometric features and volumes,cubes andpolyhedrons,prisms,pyramids,frustum of pyramids, cylinders,cones andspheres.Features:
1.Volume measurement and verification
2.Geometry 3Drotation observation
3.Realize geometry connection,tangent and combination
4.Geometry surface expansion andrestoration
5.Realize the simulation demonstration of the rotating mode
6.Dynamic section simulation,observe features at any time
7.Visually demonstrate the relationship between points,lines and pilanes in space
8.Application ofinternal auxiliary lines in height, diagonal,oblique,etc