1. The problem asks if a triangle with side lengths 12 inches, 14 inches, and 13 inches is isosceles. 2. An isosceles triangle has at least two sides of equal length. 3. Check the side lengths: 12, 14, and 13. 4. None of these sides are equal to each other. 5. Therefore, the triangle is not isosceles. Final answer: no, the triangle is not isosceles.