Okay I just finished adding the interior angle arcs and markings to line segments (vertical angles), triangles, rectangles (all 90 degrees), and polygons. These all work with the hide/show intersections and angles button that toggles them on and off. This took me a little while since I had to implement the math for calculating each shape’s interior angles, but ESPECIALLY because I ended up spending an entire hour debugging the line segment arcs and adding at least 4 more console logs for it. I wanted the vertical angles to be clearly labeled (2 different colors) as 2 equal pairs across from each other, and it was such a struggle to render them correctly as such. At least it’s fixed now, and I can finally move onto my next step. What I want to do this time is add a side bar of some sort next to the grid to display the equations used for each shape’s calculation of perimeter, area, angles, etc.