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  3. 8. [c] the surface of the earth can be modeled by

8. [C] The surface of the Earth can be modeled by a unit sphere. The Arctic...

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Basic Math

8. [C] The surface of the Earth can be modeled by a unit sphere.The Arctic Circle is the circle on the unit sphere at an angle of φ= 23.5 ◦ from the +z-axis. What percentage of the Earth’s surfacelies above the Arctic Circle?

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