Unlike the isosceles triangle, which is formed by two equal sides and one unequal; and the equilateral triangle, which is formed by three equal sides. The scalene triangle is formed by 3 sides of different measures, for this reason and according to the image that shows a triangle with the left side of 3, the bottom side of 4 and the top side of 5. It can be concldued this triangle can be classified as scalene. then the correct choice is A. scalene
