BASIC PROPORTIONALITY THEOREMIf a line is drawn parallel to one side of a triangle, the other two sides of the triangle are divided proportionally.

Thus, in Fig. DE || BC, According to the above result

Properties of Median

The median is a segment that starts at one of the 3 vertices of the triangle and ends at the midpoint of the opposing base.

In the below figure the three medians are Ma=AP, Mb=BQ and Mc=CR.