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Assume that the Earth is a sphere with a radius, $r$ , of $6.38 \\times10^3 km$.
\n", "advice": "In this question use the formula for the surface area of a sphere.
\n$A = 4\\pi r^2
\nThis should return a value of {s_area_act} on your calculator
\nrounded to three significant figures this is {s_area}
\nIn standard form this is $5.12 \\times 10^8$
\nYou may have received credit for writing your (a) in standard form correctly.
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[[1]]$\\times 10$[[0]]
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