Let be a triangle with incenter and , , . The circle centered at passing through intersects line at two points and . Compute the length .
Proposed by Evan Chen
Let be a triangle with incenter and , , . The circle centered at passing through intersects line at two points and . Compute the length .
Proposed by Evan Chen
1. Define the given parameters and setup the problem:
- Let be a triangle with incenter .
- Given side lengths: , , .
- The circle centered at passing through intersects line at points and .
- We need to compute the length .
2. **Calculate the semi-perimeter of :**
3. **Determine the length where is the foot of the altitude from to :**
4. **Express the radius of the circle centered at passing through :**
5. **Calculate the power of point with respect to the circle :**
- Let be the foot of the altitude from to .
- The power of is given by:
- We know:
- Therefore:
6. Simplify the expression:
7. **Calculate :**
- Since .
8. **Determine :**
The final answer is