I have a u shape and i want that 2 vertex join and make a arc. In the image i have shown the u shape black color and red color arc. Can we join the 2 green color pointed vertex and make a arc. Any method to join them and make a arc quick and simple[![enter image description here](https://i.stack.imgur.com/PN4XW.jpg)](https://i.stack.imgur.com/PN4XW.jpg)