Techinal Drawing

To construct an angle

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Angle of 60
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AN ANGLE OF 60
 
  • On a given AB, construct an angle of 60 at A
  • With centre A and any radius, draw an acr to intersect AB at C
  • With centre C and the same radius, draw an arc to intersect the first arc at D.
  • Draw a line through D to meet A
  • Angle DAB is the required angle.

AN ANGLE OF 90

  • On a given line AB, construct a perpendicular at A
  • With centre A and any radius, draw an arc to intersect AB at C
  • With the same radius, starting at C, mark off 60 and 120 at D and E
  • With centres D and E, strike arcs to intersect at F
  • Draw a line through F to A. FA is perpendicular to AB

 

 

 

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