1,000 square miles:
-- a square 31.6 miles on every side
-- a circle 35.7 miles in diameter
-- an equilateral triangle 48.1 miles on every side
-- a rectangle 100 miles long and 10 miles wide
-- 640,000 acres
-- 3,097,600,000 square yards
-- 27,878,400,000 square feet
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A square mile is equal to 5,280 feet by 5,280 feet, which means there are 27,878,400 square feet in one square mile.
1 kilometer is equal to 1000 meters.
Jacksonville, Florida has a total land area of approximately 874 square miles.
The Earth has a total land area of approximately 57.5 million square miles or 148.9 million square kilometers. This land area includes continents, islands, and other landmasses.
Earth has a total surface area of about 510 million square kilometers, of which approximately 29% is land and 71% is water. This means that about 148 million square kilometers of land surrounds the Earth.