That's called "solid geometry".
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It is the study of shapes in 3-dimensional space.
Learning geometry is important because it embraces algebra, trigonometry, Pythagoras' theorem, properties of a triangle, properties of a circle, properties of 2 dimensional and 3 dimensional shapes, coordinated geometry .... and so much much more
solid shapes are 3-D
Many shapes have curves. Some curved shapes include:circle (2-dimensional)cone (3-dimensional)sphere (3-dimensional)cylinder (3-dimensional)
You know how 2-dimensional shapes are flat right? Well 3-dimensional means that it can go to and from you also.