A flat pattern is displayed with sheet metal bend notes. You can set options for bend notes in Document Properties - Sheet Metal.
In draft, you also can add the centerline to a bend (A) using the By Two Lines option with the Center Line command.
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Sheet metal parts start out flat, but are deformed to new useful shapes. Therefore it is common to draw sheet metal parts in the deformed, ...
There are special drafting techniques for rounded, or curved surfaces, these can be found in any drafting textbook.
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