The average of all possible whole number lengths for the third side is 20.
The Triangle Inequality theorem states that the sum of any 2 sides of a triangle must be greater than the measure of the third side.
Here, difference of two sides < x < sum of two sides,
will give you the possible length of a triangle.
(25 - 13) < x < (25 + 13)
12 < x < 28
So, the value of third side lies between 12 and 28.
The average possible length = (12 + 28) /2 = 40/2 = 20.
Thus, the average of all possible whole number lengths for the third side is 20.
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