Given the three vertices a (1,2), B (3,4) and C (2,6) of ladder ABCD, find the point direction equation of the straight line where the median line of the ladder is located?

Given the three vertices a (1,2), B (3,4) and C (2,6) of ladder ABCD, find the point direction equation of the straight line where the median line of the ladder is located?

It is mainly divided into CD ∥ AB and ad ∥ BC
For example, CD ‖ AB, then the midpoint coordinates of BC know that the median line and ab are parallel, and the slope is calculated according to ab
Straight line analytical formula
In another case