équerre -> try-square, tri square

Frederique

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équerre -> try-square, tri square

Instrument formé de deux pièces ajustées à angle droit, l'équerre est utilisée soit pour vérifier des angles dièdres droits, soit pour tracer des angles plans droits..
Wikipédia



A try-square is a woodworking or a metal working tool used for marking and measuring a piece of wood. The square refers to the tool's primary use of measuring the accuracy of a right angle (90 degrees); to try a surface is to check its straightness or correspondence to an adjoining surface. A piece of wood that is rectangular, flat, and has all edges (faces, sides, and ends) 90 degrees is called four square. A board is often milled four square in preparation for using it in building furniture. Try-square is sometimes spelled "tri square".
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