528 square feet. Just multiply length by width - the answer is the square footage.
pretty simple equation length X width gets you square feet.. 20'X24'= 280 Sq feet
24 x 24 = 576 square feet.
24 x 18 = 432 sq feet
16 x 24 = 384 (square feet).
24X100
400 square feet.
525 square feet.
120 square feet.
252 square feet.
324 square feet.
130 square feet.
352 square feet.
140 square feet.
770 square feet.
240 square feet
300 square feet.
162 square feet.