# Triangle 75

Triangle ABC has angle C bisected and intersected AB at D. Angle A measures 20 degrees, and angle B measures 40 degrees. The question is to determine AB-AC if length AD=1.

## Correct answer:

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

**planimetrics**- triangle
- The Law of Cosines
- The Law of Sines
**numbers**- fractions
**goniometry and trigonometry**- sine

### Units of physical quantities:

### Grade of the word problem:

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