if your inside space is 5'9" by 4'3" you multiply the two together to get your square footage. so you'd say 5 feet and 9/12 which is 3/4 right? so 5.75 feet times 4 feet and 3/12 which is 1/4 which is 4.25 feet. so your square footage inside is 24.44 approximately. make sense?
btw, the...