What are the minimum dimensions for a sukkah?

A kosher sukkah must have at least 3 walls, and each wall must have a minimum length of 28 inches (7 tefachim x 7 tefachim)³. The walls of the sukkah must extend at least 40 inches high⁴, and the walls may not be suspended more than 9 inches above the ground⁵ (this is a common problem with fabric sukkahs).
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3. Shulchan Aruch (O.C. 634:1)
4. Shulchan Aruch (O.C. 633:8)
5. Shulchan Aruch (O.C. 630:9)