What is the best spacing for the working triangle?

If you are talking spacing. To many designers and appliance dealers, the ideal setup is to have the Sink, the cooking item, and a fridge should all be around 4-9ft from each other. 13ft is usually the max run on one side. In my humble opinion, I feel it is user-based. Each home is so unique in its spacing, floor plan, and layout, so you can tweak this option. The concept is to keep the kitchen in a good workflow. You don’t want to be running around an island when trying to cook. Some people put them too close as well, so they group the appliances so tight that you end up tripping over other people in the kitchen and get boxed in.

Here is a graphic showing this concept in different layouts. -Al