Given that the coordinates of the three vertices of ladder ABCD are a (- 2,3), B (- 2,1), C (6,5), the equation of the straight line of the median line of the ladder is obtained

There are two cases in this problem. One is that AB is the bottom. This is that the median line must be parallel to ab. that is to say, the median line is vertical. The slope is 0 and it passes through the midpoint of AC, so the straight line is x = 2
The other is the slope with AC as the base and the slope with AC as the base
The slope is 20 below the root
We have to go through the midpoint of AB (- 2,2) and then the equation comes out

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