Find the radius of a circle whose circumference is 57.2 cm.
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Due to the cold temperature of space, the surface layer of earth cooled off quickly. ... And forms solidified "outer layer of the earth" called lithosphere. Differentiation of magma makes two types of "lithosphere, oceanic" and continental which is characterized in the continents by "basalt in oceans" and granite.
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circumference= 2*pi*r
2*22/7*r=57.2
therefore r≈9.1
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