About 40,000 kilometers.
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to find the diameter of a circle when you only have the circomference you: divide the circomference by pi (approx. 3.14)
Forests
Less than 3%
I think it is just one. The Moon
Covers 30 percent of the earths landmass, covers 20 million square miles of ocean, touches more than 67 percent of the earths coastline