👉 In mathematics, a scalene triangle is a triangle in which all three sides are different lengths. This means that no two sides have equal length and that the angles opposite these sides add up to 180 degrees (or π radians). A scalene triangle can also be defined as one where each side has an angle of 60 degrees or less, unless it is a right triangle (a 45-45-90 triangle), in which case all three angles are equal