Fill in the Blanks Drawing tools description Online version Fill in the blanks with the appropiate words about the description and utility of each drawing tool. by Manuel Jesús García Rodríguez 1 compass 60 eraser CAD mechanical protractors squares set leads perpendicular ruler hardness sharpener 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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