
Drawing the second line across the inner circle breaks the inner circle into two continuous lines. The first line you draw creates endpoints that break the segments in the outer circle, but not the inner circle. To delete a portion of a circle, arc, or curve entity segment, you need to break the continuity.

Note: Why do you have to draw two lines to divide the offset circles? When you draw a circle using the Circle tool (or a curve using the Arc tool, or a curved line using the Freehand tool), you are actually drawing a circle (or arc or curve) entity, which is made of multiple-segments that act like a single whole. The following figure shows the bowl profile on the left and the bowl on the right. Your bowl is complete and you can delete the circle on the ground plane.

The offset distance represents the bowl thickness.
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In this example, you look at one way to draw a bowl and how to apply the technique for creating a bowl to a dome or sphere. Tip: You can use the tips and techniques demonstrated in these chair examples to create all sorts of other complex 3D models. Modeling Specific Shapes, Objects, and Building Features in 3D SketchUp 2021 - Frequently Asked Questions.
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Placing Movie Cameras in a Model of a Production Set.Developing Components and Dynamic Components.Adding Premade Components and Dynamic Components.Applying Colors, Photos, Materials, and Textures.Modeling Specific Shapes, Objects, and Building Features in 3D.Adding Text, Labels, and Dimensions to a Model.Modeling Complex 3D Shapes with the Solid Tools.Measuring Angles and Distances to Model Precisely.Offsetting a Line from Existing Geometry.Softening, Smoothing, and Hiding Geometry.Scaling Your Model or Parts of Your Model.Flipping, Mirroring, Rotating and Arrays.Dividing, Splitting, and Exploding Lines and Faces.

Introducing Drawing Basics and Concepts.
