# A triangle 7

A triangle lot has the dimensions a=15m, b=10m, and c=20m. What is the measure of the angle between the sides of b and c?

### Correct answer:

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

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Try conversion angle units angle degrees, minutes, seconds, radians, grads.

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

**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- triangle
- The Law of Cosines
**goniometry and trigonometry**- cosine
- arccosine

#### Units of physical quantities:

#### Grade of the word problem:

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