Completar frases Drawing tools description Versión en línea Fill in the blanks with the appropiate words about the description and utility of each drawing tool. por Manuel Jesús García Rodríguez 1 squares eraser ruler set sharpener leads mechanical 60 perpendicular compass CAD hardness protractors Pencils have leads of different in a scale that ranges from soft ( B ) to hard ( H ) . In case we use pencils , we have to sharpen the lead with a . If , on the other hand , we use pencils ( also called propelling pencils ) , we don't need to sharpen them because they use replaceable . We have to choose both the hardness ( usually HB ) and the thickness ( usually 0 . 5mm ) of the lead . Another necessary tool is the . It is made of rubber and is used to erase what we draw with a pencil or mechanical pencil . The enables us to measure short distances in centimetres and millimetres . The work together to make parallel and lines , and to draw some angles aswell . They are named - 30 set square and 45 set square . We use the to draw arcs or circles in drawings , as well as to trasnport segments . We use to draw angles and to measure angles . In the past , architects and engineers drew on a drawing board . However , nowadays it's much more common to use software .
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