On an Olympic size track (400 meters), 25 laps = 10000 meters.
20 x 20 = 400 (square meters).
400
400 square feet = 37.16 square meters.
http://www.dict.cc/400 square meters is approximately equal to 0.0988421526 acres.
You don't convert square meters to meters. Those are two very different things.
400 square meters are 4.3 thousand square feet.
37.161216 m²
400 square metres
1 foot = 0.3048 meter 400 sq feet = 400 x 0.3048 x 0.3048 sq meters
one square foot is equal to 0.0929 square meters, multiply this by 400 and the answer is 37.16 square meters
400 sq metres = 4305.564 sq feet (to 3 dp)