# Calculate 83431

In triangle ABC, the size of the exterior angle at vertex C is equal to 126°. The size of the internal angles at vertices A and B are in the ratio 5: 9. Calculate the size of the internal angles α, β, γ of triangle ABC.

## Correct answer:

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

**geometry**- similarity of triangles
**algebra**- expression of a variable from the formula
**planimetrics**- triangle
**basic functions**- ratio

### Units of physical quantities:

### Grade of the word problem:

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