to find it, we find the center point of each line and find the perpendicular line to it, the intersection is the circumcenter first name the triangle A=(-4,0) B=(-4,-4) C=(-1,-4) the midpoint of AB is (-4,-2), the line perpendicular is y=-2 the midpoint of BC is (-2.5,-4), the line is x=-2.5 find the intersection at (-2.5,-2) at (-5/2,-2) 2nd one is answer