AD=(0−3)2+(0−2)2+(6−0)2​=9+4+36​=49​=7 Since BE is the median, E is the mid-point of AC.∴ Coordinates of point E=(20+6​,20+0​,26+0​)=(3,0,3) BE=(3−0)2+(0−4)2+(3−0)2​=9+16+9​=34​ Since CF is the median, F is the mid-point of AB.∴ Coordinates of point F=(20+0​,20+4​,26+0​)=(0,2,3)Length of CF=(6−0)2+(0−2)2+(0−3)2​=36+4+9​=49​=7 Thus, the lengths of the medians of △ A B C are 7, 34​, and 7.