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This is a 3D shape. Its a cube.3D shapes are when you have sides and a back.3D shapes can be in any colors. Also in any size.

This is a 2D shape.Its a flat triangle.Just so you know 2D shapes are flat.2D shapes do not have sides or back. It could be in any color. Or size.

Thats all about 2D and 3D shapes.