Fermat point
Fermat
Drag point D to find the minimum distance for the roads.
See triangle below for Fermat 2
In the triangle below, find the distances FG,FH, and FJ.
Fermat 2
In the box titled Input in the window above type the following: distanceFG+distanceFH+distanceFJ then press enter.
Press the three bars in the upper right corner of the window above, choose View, and Algebra. A new window will appear on the left. Look for the heading number and the letter a. That should be the sum you can drag that onto the window with the map.
Drag F until you find the smallest sum and therefore the location for the shopping center.