Straighten a span segment
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Select the span segment between the wall and grid D3 (as shown in the previous figure).
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Turn on Snap to Intersection ().
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Select the Rotate tool ().
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Click at the end of the span segment at grid D3.
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Click at the end of the span segment at the wall.
The command line prompts Enter rotation end angle.
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Enter 180 and press <Return>.
The selected span segment is now horizontal.
Diagonal strip that warrants manual improvement.