The formula for the area of a triangle given the medians
and its proof, is found on this University of Georgia site:
http://jwilson.coe.uga.edu/emt725/Medians.Triangle/Area.Medians.Tri.html
The formula is:
where u,v, and w are the three medians.
Substituting u=18, v=24, w=30 (all in centimeters),
= 288 cm²
Edwin