Any triangle where all 3 sides are different (Scalene) and all three angles are less than 90 degrees (Acute). read more
Some examples are right triangles, acute triangles and obtuse triangles. The lengths of the sides of triangles is another common classification for types of triangles. Some examples are equilateral triangles, isosceles triangles and scalene triangles. The following figures show the different types of triangles. read more