# Largest angle of the triangle

Calculate the largest angle of the triangle whose sides have the sizes:

2a, 3/2a, 3a

2a, 3/2a, 3a

### Correct answer:

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Cosine rule uses trigonometric SAS triangle calculator.

See also our trigonometric triangle calculator.

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

**algebra**- system of equations
- expression of a variable from the formula
**planimetrics**- triangle
- The Law of Cosines
- The Law of Sines
**goniometry and trigonometry**- sine
- arcsine

#### Units of physical quantities:

#### Grade of the word problem:

We encourage you to watch this tutorial video on this math problem: video1

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