There’s also an option to draw a parabola in the Curve Maker extension in the Extension Warehouse.
I haven’t found a way to come up with an extremely accurate way to locate the focus, though. It can be approximated but due to the nature of curves in SketchUp–made up of short line segments–it’s not not perfect. The more segments you use to make the curve, the closer you’ll come to the real focus point.
This was done using a parabola drawn with Curve Maker. I expect it’ll be close enough for government work.
Parabola.skp (33.2 KB)
