# Tropics and polar zones

What percentage of the Earth's surface lies in the tropical, temperate, and polar zone?

Tropics border individual zones at 23°27' and polar circles at 66°33'.

Tropics border individual zones at 23°27' and polar circles at 66°33'.

### 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
- spherical cap
**planimetrics**- right triangle
- triangle
**basic functions**- percentages

#### Units of physical quantities:

#### Grade of the word problem:

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