Extending an arc beyond an existing point

Hi everyone, I’ve tried all morning to extend an arc (A15-A10 on the screenshot). I would like the arc to extend above A10 for 0,5cm and creating a new point at the end of it. I’ve found a manual workaround but it’s quite long and involves creating other lines and arcs. Would there be any simpler way to do this ? I am just starting off with Valentina and any suggestions would be much appreciated. Thank you and Happy New Year !! 43|860x411