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

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:

**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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