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
The lengths of two sides are not enough to determine the perimeter of a triangle: Either the third side or else the angle between the two given sides is also needed. If two of the sides are 10m and 25m, then the third side can be anything between 15m and 35m, and the perimeter can be anything between 45m and 70m.