To find the square footage of a room, you simply multiply the length of the room (in feet) by the width of the room (in feet). The answer is the square footage of the room (assuming the sides opposite each or are equal in length)
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To calculate the square footage of a room, you multiply its length by its width. For a room that is 21 feet long and 14 feet wide, the square footage would be 21 x 14 = 294 square feet.
To find the square footage multiply both the length and width of the room. So for 72 feet wide and 156 feet long room the square footage is = 72 feet X 156 feet = 11232 square feet.
Multiply them together.
approx. 172.5 square feet
330 square feet