# Heptagon's 83628

Calculate a regular heptagon's perimeter if its shortest diagonal length is u=14.5cm.

## Correct answer:

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Cosine rule uses trigonometric SAS triangle calculator.

See also our trigonometric triangle calculator.

Try conversion angle units angle degrees, minutes, seconds, radians, grads.

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

**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- polygon
- triangle
- diagonal
- The Law of Cosines
**goniometry and trigonometry**- cosine

### Units of physical quantities:

### Grade of the word problem:

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