Which lengths represent the lengths of the sides of a scalene triangle: 3, 4, 5; 4, 4, 5; 12, 7, 7; 15, 15, 15?

##3,4,5" "## A scalene triangle by definition has three unequal sides.

##4,4,5 and 12,7, 7## are isosceles triangles because they have two equal sides .

##15,15,15 " "##is an equilateral triangle -it has three equal sides.