40' means 40 ft - the symbol ' represents the word foot/feet.
40' x 25' = 1000 sq ft.
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One acre is equal to 43,560 square feet. Therefore, 25 acres is equivalent to 1,089,000 square feet.
1 square foot is equal to the area of a square with sides that are each 1 foot in length. So, 1 square foot is equal to 1 foot multiplied by 1 foot, which equals 1 square foot.
When the length and width of the room are equal to 40 feet. In this way, you will have 40 x 40 equal 1,600 square feet.
There are approximately 269.1 square feet in 25 square meters.
25' x 65' = 1,625 square feet.