Same as in photoshop the ellipse tool in illustrator is used to make ellipse of any shape and a perfect circle shape.
Usig ellispe tool in illustrator for roofs.
Click and hold the ellipse tool and select the polygon tool.
Os and version of illustrator.
Click on three dots at the bottom of toolbar and check if you see ellipse tool in the list of all tools.
Drawing this way will make the guide boxappear on the outsideof your ellipse circle see below.
As per your query ellipse tool was there sometime back but got disappeared all of a sudden.
Thanks for reaching out.
I would request if you can share a few more details like.
You ll draw the roofs in this step.
That s definitely not usual.
In illustrator the ellipse tool is below type tool and besides paintbrush tool.
Click anywhere on the artboard and type sides.
Drawing with the ellipse tool l using a guide box and the command key.
Create a circle or an oval shape with this tool in your documents of i.
In this video you can learn how to use the ellipse tool in adobe illustrator cc 2019.
Drawing with the ellipse tool l using a guide box start by drawing from your initial corner intersection with your mouse then release your mouseat your destination intersection.
Use the center point widget to reposition the triangle as shown.