550 



CAMBRIA STEEL. 



MENSURATION. 



LENGTH. 



Circumference of circle = diameter X 3.1416. 

 Diameter of circle = circumference X 0.3183. 

 Side of square of equal periphery as circle = diameter X 0.7854. 

 Diameter of circle of equal periphery as square = side X 1.2732. 

 Side of an inscribed square = diameter of circle X 0.7071. 

 Diameter of circle circumscribed about square = side X 1.4142. 

 Circumference of circle whose diameter is 1 = 

 v = 3. 14 159265 



log. TT = 0.4971499 

 V7= 1.772454 



= 0.318310 



=0.101321 



= 0.564190 



= r-Vr 2 - \=^ tan--=2rsin 2 --=r+o-Vr 2 -: 



Length of arc = 



= .01745*33 r A 



Angle A = 



180 Xarc^57.29578Xarc 

 TIT r 



A c 2 -4v 2 



cos = 



2 c 2 +4v 2 



For division of circle into n parts, c = 2r sin 



180 C 



