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How Big is the Earth? 
Earth is the third in distance from the sun and the fifth largest of the planets in diameter.
The earth is not a perfect sphere but is slightly flattened at the poles. The diameter of the earth measured around the North Pole and the South Pole is about 42 km (26 mi) less than the diameter of the earth measured at the equator.
The circumference of the Earth at the Equator is 24,902.4 miles or 40.076.5 km.
The diameter which is the distance across the center at the equator (equatorial diameter) is 7926.42 miles or 12,756.34 km.
The Polar diameter (measurement between the poles) is 7899.83 miles or 12,713.54 km.
Total surface area is 510,100,000 sq. km (196,950,000 sq. miles)
Volume is 1,083,230,000,000 cubic km (259,880,00,00 cubic miles)
Average density is (water=1) 5.52
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