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                            AN ANGLE OF 60   
                           On a given AB, construct an angle of 60 at AWith centre A and any radius, draw an acr to intersect AB at CWith centre C and the same radius, draw an arc to intersect the first arc at D.Draw a line through D to meet AAngle DAB is the required angle. AN ANGLE OF 90 
                           On a given line AB, construct a perpendicular at AWith centre A and any radius, draw an arc to intersect AB at CWith the same radius, starting at C, mark off 60 and 120 at D and EWith centres D and E, strike arcs to intersect at FDraw a line through F to A. FA is perpendicular to AB      
                           
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