# The Earth

The Earth's surface is 510,000,000 km

^{2}. 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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