1. Identify the given lines and their properties:
- Let a be the perpendicular bisector of side BC.
- Let b be the angle bisector from vertex B.
- Let c be the angle bisector from vertex C.
2. Reflect the angle bisectors about the perpendicular bisector:
- Construct line b′ by reflecting b about a.
- Construct line c′ by reflecting c about a.
3. **Determine the positions of vertices B and C:**
- Vertex B is the intersection of lines c′ and b.
- Vertex C is the intersection of lines b′ and c.
4. Construct the sides of the original triangle:
- Reflect side BC about the angle bisector b to get a line. This line will be one of the sides of the original triangle.
- Reflect side BC about the angle bisector c to get another line. This line will be another side of the original triangle.
5. **Find the intersection of the reflected lines to locate vertex A:**
- The intersection of the two reflected lines (from step 4) will give the position of vertex A.
6. **Reconstruct the original triangle ABC:**
- Connect vertices A, B, and C to form the triangle.
The original triangle ABC is restored.