Curved Surfaces and Centerlines . Sections 11.02 and 10.07 of Text . Objectives . Understand how curved surfaces will appear in each viewing plane. Create orthographic projections of objects with curved surfaces. Correctly use center marks and center lines to add clarity to drawings. .
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Sections 11.02 and 10.07 of Text
Visible extents of cylinder
Circular end of Cylinder
This arc is 180°
This arc is 90°
Centermark, note the extension lines
Visible limit of arc