Look at the extracts from technical discussions on a construction site.
complete the sentences using the words in the box. look at b opposite to help you.

gridline, interest, parallel, perpendicular, set out, square off

1. according to this drawing, 8 runs along the external wall of
the structure.
2. the positions were marked accurately – they were by our site
engineer.
3. the external wall runs along gridline i, and the internal corridor wall runs
along gridline 2, so the walls are with each other.
4. i’ve marked a cross on the concrete floor, showing where the two

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