Question

angle bisectors perpendicular bisectors altitudes medians

Explanation:

Step1: Recall definitions

• Angle bisectors: Divide an angle into two equal parts.
• Perpendicular bisectors: Are perpendicular to a side and bisect it.
• Altitudes: Are perpendicular from a vertex to the opposite side.
• Medians: Connect a vertex to the mid - point of the opposite side.

Step2: Analyze the properties related to the in - center

The in - center is the point of intersection of the angle bisectors of a triangle.

Answer:

angle bisectors