# Rhombus 36

Rhombus ABCD with side 8 cm long has diagonal BD 11.3 cm long. Find angle DAB.

## Correct answer:

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Do you want to convert time units like minutes to seconds?

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:

**algebra**- expression of a variable from the formula
**planimetrics**- Pythagorean theorem
- triangle
- rhombus
- diagonal
- The Law of Cosines
**goniometry and trigonometry**- cosine
- arccosine

### Units of physical quantities:

### Grade of the word problem:

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