If a line drawn through two sides of a triangle parallel to a third side, it divides those sides proportionally.In the triangle ABC draw EF parallel to BC.
Let MB be contained m times in EB and n times in AE. Then
This explanation assumes that a value exists for MB that will divide into both EB and AE a whole number of times. This may not always be true. In this case consider making MB smaller and smaller, making m and n bigger numbers, until it the remaining part of the triangle left over approaches zero.

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