a triangle with a whole number sides has a perimeter 6 how many sides have the same lenght

Answer 1

Let me give you a hint.

Think of all the different ways in which you can add three whole numbers (the lengths of the three sides) to get 6 (the perimeter). You'll find that there are 3 ways to do that, of which 2 will be invalid because of a certain property of triangles, and the remaining will tell you how many sides have the same length.

Try this and if it doesn't help, come back and ask again.