Drawing a rectangle in archway

In the attached exercise, in order to create a surface on which to draw arcs for a slide, the instructor draws a rectangle on the face of the archway opposite the round holes. Using the rectangle tool, he starts in the lower corner, goes to the right hand edge of the opening, puts in the desired size 6", 33" and clicks, forming a face.
When I do this, the dimensions are reversed, i.e., when I draw the same rectangle the dimension box says 33", 6". If I put these dimensions in and click two faces are formed: the one I want and another one covering the rest of the opening. What am I doing wrong?
Thanks, Ken
Practice playground.skp (630.4 KB)

I suspect the problem you are running into is that the shape with the arches isn’t in a group or component yet so when you draw the rectangle over it, those faces merge. Put the geometry into a group or component first and then draw the rectangle.

That worked. Guess I missed where the instructor made it a group.
Thanks, Ken

Get into the habit of of making a group or component of anything that would be an individual part in real life. I don’t know what the rectangle is for but I assume it would be fabricated separately from the arched panel so the panel should be a group or component.

Try to think about the parts you are modeling as if you are making them in the shop and group the geometry accordingly. For example, if the cylinders at the bases of the posts represent concrete footings, maybe you should model the footings as separate from the posts.

Modeling this way helps to keep things arranged logically and it makes it easier to make future changes if/when they become necessary. It also makes it possible to add details where parts come together. If you get into modeling furniture for example and you want to show joinery, you need the parts to not be merged together.

Thanks Dave I will keep those tips in mind! Ken

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