220 On the Multisection of an Angle, ^c. 



tiou CN would be equal to twice tlie tangent of 30°, and 

 together witli BN would he equal to AFB, the semicircum- 

 ference of the generating circle. But BC = DM + OC, and 

 FM — the arc AF = i of the circumference, .*. T)F + OC = ^ 

 of the circumference, .*. BN = 2DF = the axis BA. Thus, 

 on the supposition that the angle CMO = 30°, the base BC 

 would be equal to twice the radius, and twice the tangent of 

 30°, and would be equal to 3.15470 instead of 3.14159. 



