# ABCD

AC= 40cm , angle DAB=38 , angle DCB=58 , angle DBC=90 , DB is perpendicular on AC , find BD and AD

## Correct answer:

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

**planimetrics**- right triangle
- triangle
- The Law of Cosines
- The Law of Sines
**goniometry and trigonometry**- sine
- cosine

### Units of physical quantities:

### Grade of the word problem:

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