In the triangle ABC, side AB=38, side AC=48, side BC=68.
If 38, 48 and 68 are the numbers on the sides we add them together: 38+48+68=154.
Now divide by 2: 154/2=77.
The vertex C (corner) opposite the side AB=38 will be 77-38=39.
The vertex B opposite the side AC=48 will be 77-48=29.
The vertex A opposite the side BC=68 will be 77-68=9.
9
38 48
29 68 39