The Earth
The Earth's surface is 510,000,000 km2. Calculates the radius, equator length, and volume of the Earth, assuming the Earth has the shape of a sphere.
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- algebra
- expression of a variable from the formula
- solid geometry
- sphere
- surface area
- planimetrics
- circle
- perimeter
Units of physical quantities:
Grade of the word problem:
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