Answer:
8
Step-by-step explanation:
The triangle is isosceles so the answer is either 3 or 8.
You might think there are 2 answers. There are not. The base is 3 inches and the two equal sides are 8 inches a piece.
If you say that there are 2 sides of 3 inches each, they add up to 6. They can't. Six is much smaller than 8 and so two sides of 3 don't even cover up the 8, let alone make a triangle.