Oh, dude, you're really testing my math skills here. So, a 13x12 room would have 156 square feet. It's like, you take the length and multiply it by the width, and boom, you've got your answer. Math can be fun, right?
14.5 square meters.
13X12=156 sq ft.
400 square feet.
16' x 15' = 240 square feet.
360 square feet.
14.5 square meters.
156 square feet. (just multiply the two)
13X12=156 sq ft.
400 square feet.
240 square feet
162 square feet.
525 square feet.
300 square feet.
252 square feet.
120 square feet.
16' x 15' = 240 square feet.
A simple rectangular room 20 feet by 18 feet has 360 square feet.