A. 12
Explanations:Let the first side of the triangle be, x = 4
Let the second side of the triangle be , y = 15
Let the third side be represented as z
The third side of the triangle (z) will take a value that is greater than y - x, but less that x + y.
This can be described mathematically as:
y - x < z < x + y
y - x = 15 - 4
y - x = 11
x + y = 15 + 4
x + y = 19
This means that:
11 < z < 19
Among the options, the only value that is in between 11 and 19 is 12
The only value that could be the length of the third side is 12
