Drop a perp from C onto AB, call its length u, then Area(ABC)=12*u/2=72,Originally Posted byjacs

so u=12. Then the length of the perp from X onto AB is u/2=6 (similar

triangles).

Drop a perp from B onto AC, call its length v, then Area(ABC)=8.v/2=72,

so v=18. Then the length of the perp from X onto AC is v/2=9 (similar

triangles).

RonL