<em>L x W x H</em> is what you use to find the volume of a parallelopiped ... like a cube or a box.
Cylinders and spheres don't have lengths or widths, and spheres don't have heights either. The formulas for their volumes look different.
Cylinders and spheres both have a 'radius' ... that's the distance from the center of a circle out to the curved edge of the circle. In a cylinder, the circle is what you see when you look at one end of it. For the sphere, it's just the distance from the center of the sphere to the surface, because no matter what direction you cut the sphere, if your cut goes through the center, then you always get the same circle.
Both formulas also involve the number called 'pi' (PIE). It's the number that always pops up whenever anybody is doing anything with circles and a lot of other things in math and science. The thing about 'pi' is that it's impossible to write its exact value with digits ... the decimal part of it keeps going and going and never ends. The beginning of 'pi' is 3.14159 26535 89792 ... and it just keeps going forever. In school, most teachers tell you to use 3.14 for pi. The answers you get aren't exactly correct, but that's not a big deal, because the answer is never the important part of the problem in school. The important part is that you LEARN HOW to solve the problem and find the answer.
In math and science writing, when pi has to be written down, it's usually not written with digits at all. It's usually written with the letter from the Greek alphabet called pi. It looks like this: π
Now, here are the formulas you asked for, for the volumes of cylinders and spheres:
<u>For a cylinder:</u> <em>V = π R² H</em>
Volume = (pi) x (square of the radius) x (height of the cylinder)
