It depends on the shape.
There are relatively straightforward formulae for a sphere, cylinder, cone, prism (including cuboid), pyramid. Less simple formulae for parallelepipeds, ellipsoids and perhaps complex ones for other simple shapes. And then you have seriously complex 3-d shapes (a lump of putty) for which there are virtually no direct formulae.
Volume
Well it depends on what kind of 3d shape it is. There is a formula to find the volume of each 3d shape. The main formula for volume is Bxh. (Big B multiplied by the height.) Bxh means the area of the base times the height.
The answer will depend on what "it" is.
The 3D space inside a shape is it's volume.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
Volume
It's volume.
Well it depends on what kind of 3d shape it is. There is a formula to find the volume of each 3d shape. The main formula for volume is Bxh. (Big B multiplied by the height.) Bxh means the area of the base times the height.
The answer will depend on what "it" is.
The 3D space inside a shape is it's volume.
Volume. The formula depends on the shape.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
Only if the shape is a cuboid.
It is a volume (3D) shape - "solid" has nothing to do with it.
It doesn't have any volume (3D) and it's not a line (1D). Thus, it is a 2D shape.
They are shapes that occupy a volume in space. They have a length, width (or breadth) and height.
That will depend on what they are but in general 3D shapes have surface area and volume whereas 2D shapes have only surface area.