You cannot.
If the lengths of the two sides are a and b where a>=b, then all that can be said about the third side, c, is that
(a - b) < c < (a + b)
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That depends on what type of triangle is if the side given is equal to the perimeter divided by 3 then it is an equilateral triangle.
count the grids
You find the three sides of the triangle, and assure that they are all in the same unit, and then add the sides together to find the perimeter of the triangle.
add the sides toghther and then you'll have your perimeter of your triangle
To find the perimeter of a triangle you have to add up all the sides. So to find the perimeter of this triangle you just add 2x+5x+6x=13x. To find the actual perimeter you would have to know what x equals