Drawing a simple arch with the curve tool I think I'm losing my mind. I just want to draw a simple arch shape with the curve tool so that I can extrude it into a solid. I can add a bezier curve, I can move the points around, I can move the handles, I can add and remove points. But I can't figure out how to do anything else.


How do I make my drawing symmetrical?
How do I connect the end points of the bezier curve to create a closed shape?
How do I make sure that the curve has the correct measurements and proportions?


I just want to create something like the below but I cannot figure it out. I've spent hours searching how to do it and I just can't get it to work. I don't even really know how to describe my problem to search for it.
Let's go one by one:


Add the Mirror Modifier
Go Curve > Toggle Cyclic, shortcut: Alt+C (but it will mess with the mirror modifier)
Use Orthographic view and enable Snapping to Increment (with Absolute Grid snap)


Add the Mirror modifier



Toggle cyclic curve



Set up Orthographic view (Front/Top/Side)