 Locus of points equidistant from X and Y~ Locus of points equidistant from X and Z~ Locus of points equidistant from ¯ZXZX¯\bar{ZX} and ¯ZYZY¯\bar{ZY}~ Locus of points equidistant from ¯XYXY¯\bar{XY} and ¯ZYZY¯\bar{ZY}~