## Acute angle

### Measures less than 90 degrees

An acute angle is an angle that measures less than 90 degrees. It is considered sharp or narrow, and can be found in many geometric shapes such as triangles and rectangles. In a triangle, all three angles must be acute angles for the triangle to be classified as an acute triangle. Acute angles are commonly used in mathematics, physics, and engineering applications such as trigonometry, where they are used to calculate the sides and angles of triangles. They are also used in architecture and construction to ensure the proper angle measurements for structures such as roofs and staircases.

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