Posted by Abigail on .
The midpoint of line segment AB is (1,2). The coordinates of A are (3,6). Find the coordinates of B.
I know how to figure out midpoint, but I'm having trouble figuring out how to do this problem. Any help would be appreciated. :)

Geometry 
drwls,
The midpoint has an xcoordinate that is 4 larger than point A's. It has a ycoordinate that is 4 points less than point A's.
Apply the same changes to the midpoint coordinates to get the location of B.
The xcoordinate will be 1 + 4 = 5
You do the other one.