A cevian is a segment drawn from a vertex of a triangle to the opposite side.
In this case the point on the opposite side is a trisection point.
These cevians create seven triangles, and each triangle has an area that is
a multiple of 1/21 of the area of the original triangle.
Can you find the area of each region?
-idea from 1000 PlayThinks, by Ivan Moscovich, page 128
