DABC be a tetrahedron such that AD is perpendicular to the base ABC and `angle ABC=30
Channel: Doubtnut
Date: 2020-05-24

DABC be a tetrahedron such that AD is perpendicular to the base ABC and `angle ABC=30^(@)`. The volume of tetrahedron is 18. if value of `AB+BC+AD` is minimum, then the length of AC is