# Angle in RT

Determine the size of the smallest internal angle of a right triangle whose sides constitute the sizes of consecutive members of arithmetic progressions.

### Correct answer:

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

**geometry**- similarity of triangles
**algebra**- equation
- system of equations
- arithmetic progression
- expression of a variable from the formula
**planimetrics**- right triangle
- triangle
**goniometry and trigonometry**- sine
- arcsine

#### Units of physical quantities:

#### Grade of the word problem:

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