In the equilateral triangle above, sides a = b = c and angles A = B = C. The figure below shows an example of an equilateral triangle. All equilateral triangles are acute triangles because their interior angles will always be less than 90° by definition. Since the interior angles of a triangle sum to 180°, the interior angles of an equilateral triangle are all equal to 60°. Equilateral triangleĪn equilateral triangle is an acute triangle whose sides are all equal and whose interior angles all have the same measure. Types of trianglesĪn acute triangle can be categorized as an equilateral triangle, isosceles acute triangle, or a scalene acute triangle. An acute triangle can be equilateral, isosceles, or scalene. Since all of the interior angles are 60°, the acute triangle above is more specifically described as an equilateral triangle. An example of an acute triangle in real life is a yield sign: Acute triangle definitionĪn acute triangle is a 3-sided polygon in which the interior angles (the angles formed inside the triangle) all measure less than 90°. Generally, triangles are categorized into 6 types: acute, obtuse, right, equilateral, isosceles, and scalene. What is an acute triangleĪn acute triangle is characterized by having no angles that measure larger than 90°. Home / geometry / triangle / acute triangle Acute triangleĪn acute triangle is a type of triangle in which the three internal angles have measures of less than 90°.
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