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DABC be a tetrahedron such that AD is perpendicular to the base ABC and ABC = 30º. The volume of tetrahedron is 18. If value of AB + BC + AD is minimum then length of AC is

(A)  3(6 -3)

(B)  3(6 - 2) 

(C)  2(6 - 3) 

(D)  2(6 -2)

1 Answer

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Correct option (B)  3(6 - 2) 


v = 1/3 AD 1/2

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