Table I.
Formulas for calculating surface area and volume of two approximations of a guard cell
| Shape | Volume | Surface Area |
|---|---|---|
| Prolate spheroid |  |
 |
| Cylinder |  |
 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.