A scalene triangle is a type of triangle that has three sides of different lengths and three angles of different measures. In other words, all the sides and angles of a scalene triangle are unequal. This is in contrast to an equilateral triangle, where all sides are equal, or an isosceles triangle, where at least two sides are equal.To identify a scalene triangle, you can measure the length of each side and compare them. Alternatively, you can also compare the measures of the angles. If all three sides have different lengths or all three angles have different measures, then the triangle is scalene.In terms of properties, a scalene triangle does not have any lines of symmetry, and its angles can have any combination of measures. When calculating the area of a scalene triangle, you can use Heron's formula, which takes into account the lengths of all three sides.Visually, a scalene triangle may appear slanted or uneven, and it is commonly encountered in various geometric and real-world contexts. Understanding the properties and characteristics of scalene triangles is important in geometry and can help in identifying and analyzing different types of triangles.