A scalene triangle is a triangle in which all three sides have different lengths.
An isosceles triangle is a triangle that has two sides of equal length.
An equilateral triangle is a triangle in which all three sides have the same length.
We can see that triangle A has two sides of equal length, so it is an isosceles triangle.
We can see that triangle B has all its sides the same length, so it is an equilateral triangle. Also, this triangle has two sides of equal length. Thus, this triangle is also isosceles.
We can see that triangle C has all its sides of different lengths, so it is a scalene triangle.