# What percentage

What percentage of the Earth's surface is seen by an astronaut from a height of h = 350 km? Take the Earth as a sphere with a radius R = 6370 km.

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**arithmetic**- square root
**solid geometry**- sphere
- spherical cap
**planimetrics**- Pythagorean theorem
- right triangle
- area of a shape
- triangle
**basic functions**- percentages
**numbers**- fractions
**goniometry and trigonometry**- sine
- cosine
- arcsine

#### Units of physical quantities:

#### Grade of the word problem:

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