There are 105,600 feet in twenty miles.
There is exactly 15,840 ft. in 3 miles.
Approx 3,794,100 square milles.
20
20 x 20 = 400 square feet.
Exactly 20 feet.
400
400 square feet.
20 cm = 0.656 feet.
Do you mean a real square with the side length of 20 feet? Then 20 feet times 20 feet is 400 square feet.
55
There are 609.6 centimeters in 20 feet
20 yards is 60 feet.