Tracing angles
Linear paths

Data :

• an angle $\widehat{BAC}=\alpha$;

• a straight line (OD).

Layout :

• Determine the angle (by drawing an arc of a circle of any radius R₁ and center A which intersects [AB] at M and [AC] at N ;

• from point M, trace the arc of a circle R₂ passing through N ;

• From point O, draw a circular arc with radius R₁ which intersects the line (OD) at P ;

• From point P, draw the arc of a circle with radius R₂ which intersects the arc of a circle with...