This is so even if the fillet piece is not separated from the bone piece.
Recipes for triangles include some where you wrap the chicken thigh and spices in foil and some (see image) where you take the fillet out of the thigh and cook it separately and some where you make a triangle out of basically a thick chicken stew covered with dough.
We had chicken triangles when my daughter (from Israel) was visiting us.
My daughter's blog calls being proudly secular being a heathen (see here and here). She has observed that unlike in the United States, a proudly secular Jew who is invited somewhere for the sabbath will not willingly don a skullcap.
In our house we have a drawer near the dining table and it has a dozen or so skullcaps (aka yarmulke, kipah) and whenever we invite a Jew over for a meal, if they don't have a skullcap on, they ask for one.
Apparently it is not like that in Israel. The secular Jews feel no need to conform to religious normalistic practice.
The image on the upper left is of a fictional character who was with the IDF and a commando and who wanted to be a hairdresser.
I was employed by the Federal Highway Administration from the mid 70s to 2008. I did work in many subject areas over this time but am probably known most for managing one of the big discretionary programs, for creating Interstate designation content and for research and management in the area of highway economic development.
I did other things over the years: e.g., taught people in the FHWA how to play the card game called "schafskoft", raised a family, served in the US Navy reserves, served on the board of various civic and religious organizations.
My daughter lives in Israel and the rest of the family have visited there many times.