Triangles can be classified by the size of the angles:[br][b]Acute[/b]: all angles are less than 90°[br][b]Right[/b]: one angle has a measure of exactly 90°[br][b]Obtuse[/b]: one angle has a measure greater than 90°

Triangle can be classified by the lengths of the sides of triangle:[br][b]Scalene[/b]: no sides are equal to each other[br][b]Isosceles[/b]: any two sides are equal to each other[br][b]Equilateral[/b]: all three sides are equal.[br][br]Also, Triangle can be classified by the measures of the angles of triangle:[br][b]Scalene[/b]: no angles are equal to each other[br][b]Isosceles:[/b] any two angles are equal to each other[br][b]Equilateral[/b]: all three angles are equal (measure 60°)