GEOMETRY
posted by Anonymous .
In triangle ABC, centroid D is on the median line segment AM. AD=x+4 and DM=2x4. Find AM.

AM = AD+DM = x+4+2x4 = 3x
we also know that AD = 2DM, so
AM = 3(2x4)
so, 3x = 6x12
x = 4
AM = 12
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