Drawing a rectangle perpendicular to a circle

In the Follow Me lesson in Fundamentals course, the instructor draws a rectangle perpendicular to the surface of a circle. Using the center point in the circle as a beginning point, he draws a vertical line on the blue axis, then goes out the red axis to the edge of the circle, back down to the surface, and completes the rectangle. When he finishes it creates a new surface on which he creates a profile and uses Follow Me to make a vase.
I am able to draw the rectangle but it doesn’t form a new surface. It is transparent so I can’t draw a profile on it. I can’t figure out how to make it a new surface. Maybe I did something wrong in drawing the circle, it has shadows visible in it which the teacher’s does not seem to have.
Thanks, Ken

The fact that a face isn’t formed would imply that you either didn’t complete the loop of edges or they don’t lie in a common plane. Upload your .skp file so we can see which.

See if you have created your circle with its cardinal points on axes. This may be the cause of your problem, leading to something that looks like a rectangle but isn’t coplanar.

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I don’t think it was the circle. I wasn’t keeping the lines on the axes when drawing the rectangle so it was not in the same plane. Problem solved. Thanks!

Even if it wasn’t the circle, do make sure you drag circle radii out on axis when you are drawing them.