Hello, this thing has common 3d shapes with empty inside. I created 4 of 3D shapes which are: *Cone *Pyramid *Half Sphere *Paraboloid All they have same height and diameter. You can use these 3d shapes at Math lessons. Students can fill them up with kinetic sand or play dough. They will have fun and learn volume about 3d shapes. Note: The cone and pyramid have spikes. So watch children when playing with them. I created these 3D objects with Tinkercad.

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