Creating a sharp corner with three thick lines?

Question

I have three thick lines that intersect, and I'd like to make the corner sharp. I've tried the solution here, but since I'm adding the sharp corner and not simply removing stray lines, it's a little messy; is there a more precise way to do this instead of eyeballing the vertical position of the anchor point?

Answer 1

You need to joint the outer shape. So select the leftmost and rightmost line and hit Ctrl + j to apply join (or rmb and select from popup menu or form edit menu).

Image 1: Timelapse of joining the outer shape.