The measure of each exterior angle is 360 / 3 = 120 degrees. The measure of each interior angle is 180 / 3 = 60 degrees. Since all three sides are the same length, it follows that all three angles have the same measure.Īn equilateral triangle is a regular polygon with n = 3 sides, interior angles of 60 degrees, and exterior angles of 120 degrees.įor an equilateral triangle, we have a regular polygon with 3 sides (n = 3). Do Equilateral Triangles Have Equal Angles?Įquilateral triangles do have equal angles. ![]() This gives equilateral certain special properties, which we will discuss below. All About Equilateral TrianglesĪn equilateral triangle is a triangle where all three sides have the same length. We’ll also answer some common questions about this specific type of triangle. ![]() In this article, we’ll talk about equilateral triangles and their sides, angles, height, and area. Remember that an equilateral triangle is a special type of regular polygon: one with n = 3 sides, interior angles of 60 degrees, and exterior angle of 120 degrees. Any pair of equilateral triangles is similar, but not necessarily congruent. An equilateral triangle is isosceles and acute, but never scalene or right. ![]() So, what do you need to know about equilateral triangles? Equilateral triangles have 3 sides of the same length and 3 angles with the same measure (60 degrees), but no parallel or perpendicular sides. We can also calculate their heights and areas once we know the formulas. Equilateral triangles are common in geometry courses, so it pays to know about their sides and angles.
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