Three-dimensional solids have length, width, and height. You use a measurement called volume to figure out the amount of space that these solids take up. To find the volume of a geometric solid, you c...Three-dimensional solids have length, width, and height. You use a measurement called volume to figure out the amount of space that these solids take up. To find the volume of a geometric solid, you can use a volume formula that is specific to that solid. You may also encounter composite geometric solids. These are solids that combine two or more basic solids. To find their volume, identify the simpler solids that make up the composite figure, find the volumes of those solids, and combine them.