Answer: 0<c<24
Explanation:
In order to form a triangle the length of two sides must be greater than the third side, or in mathematical terms:
a + b > c (a, b, c can be any side and interchangeable with no problems)
You can plug in the values anywhere, but lets let a and b be 12 to get:
12 + 12 > c
c<24 (let c be the third side)
Then, to find the lower limit, we can let b and c be 12 to get:
a + 12 > 12
a > 0 (let a be the third side)
Merging the two inequalities, we get 0 < c < 24, as the two variables are interchangeable and don't matter.