Why would I laugh?
What is the shape you are trying to draw that won’t close? Not clear.
Sorry, don’t understand baseball.
What/where are these? I can see the big arcs. But they don’t join at a corner of either back or front of the stands with sloped roofs. (I have seen earlier posts about drawing the fence, and assorted other things.)
I’ve just noticed, your whole model is upside down, with the blue axis pointing downwards, not up as it should be.
Hover over one of the axes, R-click on it, then Reset axes to get things the right way up, and sky showing on top of ground.
In general, to get your lines all in the same plane, and connected, I would start by drawing a large rectangle on the red-green plane, bigger than everything in the drawing. You can tap the Ctrl key to draw from the centre of the rectangle. Place the centre of the rectangle at the centre-point of your arc where you have a guide point on the green axis, and draw it out large enough. Make it a component.
Then when you want to draw with the line tool, round whatever are the dugouts, backstop, and outfield edge, make sure the line tool is showing the On Face inference at the start and end of every line, or the Endpoint inference when you are connecting to an already drawn line.
But before you try that again, there are several things in the model you should fix first.
You have stray loose geometry in your fence assembly. Make it a single component so your lines don’t tangle up with it.
And more loose geometry at the back of the roofed stands.
AND you have the default layer set to Infield. ALWAYS, ALWAYS set it to Layer0 and LEAVE IT THERE.
When you have finished drawing an object make it into a component before you draw anything else. And make assembly components (that is, components that contain other components, and (rarely) loose geometry alongside the sub components).
Your model will be much easier to manage, and to edit, if you do that.
It looks to me that you haven’t quite yet grasped the proper use of components and groups, and the correct application of Layers ONLY to components, groups, and later, to dimensions and text.
If you haven’t already, please view or re-view the Sketchup Fundamentals video on learn.sketchup.com.
One of your unnamed groups has its axes oddly angled.
Make it into a component, set the axes sensibly (R-click, Change Axes), give it a meaningful name, and in future use components rather than groups - it is easy to name components as you make them, whereas to name a group, you have to highlight it in Entity Info, then give it an Instance name.
Your two shelters, or stands, or whatever you call them, should be mirror images of the same component, and symmetrically placed about the centreline. They aren’t - when I mirror one to the other about the green axis, they don’t register. Pick the correctly placed one, make the whole of it into a component, delete the opposite stand, then mirror the first into place.
Your back fence also isn’t symmetrical. Delete one angled side, then mirror the other into place, so it now fits against the mirrored ‘stand’, where it should be.
And now pick your line endpoints zoomed right in. You might actually find it easier to work viewing the model from underneath where you can see the stand outline and their floors (make them into components too.)
I’ve taken the liberty of doing these things to the model you uploaded. Use it if you like, but also follow the steps I used, to see the difference it has made, and how I got there.
BTW, I found it quite helpful that you saved the model with Face style/X-ray on. It makes it easier to see the centres of the fence and stand posts.
You’ll notice I said ‘mirror’ quite often. When you are modelling something symmetrical, you can save a lot of time by only modelling half, then mirroring to get the other half.
I find the simple TIG-mirror plugin useful (from SketchUcation plugin store), but you can do it with native tools, using Move/Copy, then either Flip along (appropriate axis) or Scale using -1 as the scale factor, and moving into position.
Good luck with your continued modelling.
Auburn16_JWM.skp (1.1 MB)