# Rhombus

ABCD is a rhombus, ABD is an equilateral triangle, and AC is equal to 4. Find the area of the rhombus.

### Correct answer:

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

**geometry**- similarity of triangles
**planimetrics**- right triangle
- triangle
- rhombus
- diagonal
**goniometry and trigonometry**- tangent

#### Units of physical quantities:

#### Grade of the word problem:

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