Four feet means four square feet.
The standard four-foot rice paper is eight square feet.
Four square feet can be four square feet (69*69CM).
About 2*2=4 square feet
It can also be a four-foot banner (34* 138CM).
Approximately 1*4 feet =4 square feet.
There are 33.3*33.3CM as square feet.
There won't be much difference between up and down.
Specification of ordinary rice paper (unit: cm)
Three feet: 50* 100
Big three feet: 69* 100
Four feet: 69* 138
Five feet: 84* 153
Six feet: 97* 180
Eight feet: 124.2*248.4
Zhang Er: 144.9 * 367.9