# A rhombus

A rhombus has sides of the length of 10 cm, and the angle between two adjacent sides is 76 degrees. Find the length of the longer diagonal of the rhombus.

## 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
**planimetrics**- right triangle
- triangle
- rhombus
- diagonal
- The Law of Cosines
**goniometry and trigonometry**- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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