An acute triangle is a type of triangle where all three of its angles are less than 90 degrees. This means that each angle is sharp and pointy, giving the triangle a distinct appearance. Acute triangles can come in various shapes and sizes, but they all share this common characteristic of having angles that are acute. These triangles are important in geometry and can be found in many real-world applications, such as in architecture and design. For example, the roof of a house may form an acute triangle shape, allowing for effective water drainage. Understanding acute triangles helps in studying other related concepts, such as isosceles triangles and equilateral triangles.