No, you need to include the height of the cylinder (a). Imagine a deep dish pizza (big a) versus a thin crust (small a) - the sides of the deep dish pizza have more area. Your formula returns the circumference of the pizza.
If you’re interested in dimensional analysis (and why wouldn’t you be?) the formula you proposed doesn’t have enough length units. It would return a value of length (like inches, or cm) not area (like square inches or square cm).
That would be the surface area of the crust, not the volume
How does that work out? It doesn’t take into account how large the crust is in relation to the rest of the pizza.
Sorry, the surface area of the “vertical” side of the crust, not including the top or bottom surfaces.
Still not right, I think. That would be 2πZ, not 2πZa, right?
No, you need to include the height of the cylinder (a). Imagine a deep dish pizza (big a) versus a thin crust (small a) - the sides of the deep dish pizza have more area. Your formula returns the circumference of the pizza.
If you’re interested in dimensional analysis (and why wouldn’t you be?) the formula you proposed doesn’t have enough length units. It would return a value of length (like inches, or cm) not area (like square inches or square cm).
Oh gosh, my mistake. Had just woken up.