Suppose tetrahedron PABC has volume 420 and satisfies AB=13, BC=14, and CA=15. The minimum possible surface area of PABC can be written as m+nk, where m,n,k are positive integers and k is not divisible by the square of any prime. Compute m+n+k.Ray Li Online Math Opengeometry3D geometrytetrahedroninequalitiesvectorincenter