Is the Tenshinhan's Shin Kikoho technique, a triangle or square? When Tenshinhan prepares to launch the shin kikoho, he puts his hands in the form of a triangle. 



However, the attack ends up in the form of a square according to the destroyed area. 



Does anyone have a good explanation for this?

EDIT

Thanks for everyone, I've checked the manga chapters, and it seems that he puts his hands in a diamond shape, apparently, there was a mistake when making it into anime
Though he put his hand in the form of triangle, the hole is in square/rectangular form. The answer is quite scientific. A Reuleaux triangle can be rotated to create a square shape. This YouTube video and this site explain it in more detail.

Tenshinhan's hand shape is similar to the Reuleaux triangle. Due to its shape, while it rotates, its cutting edge cut the hole in a shape of square which is shown in the gif below.