11 x 13 = 143 square feet
The formula for calculating square footage is a=S2 (a = area and s = side) Example, to calculate the square footage of a room that is 15 feet wide and 12 long, you would multiply 15 x 12, which will give you the square footage.
330 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.
240 square feet
73.5 square feet.
3*5 = 15 square feet.
if you know the footage say its 15 feet wide and 19 long than you just multiply it and thats the SQUARE FOOTAGE of the area so that
It's 176 ft2 Simply multiply the two figures together to get the square footage !
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)
225 square feet
approx. 172.5 square feet
26 * 9 = 234 square feet