MA THEM A TICS 



15 



CHORD 



c = length of chord 



2 h 



1=- r, approximately 

 3 



HELIX 



To construct a helix: 



/ = length of helix; 

 n = number of turns; 

 t = pitch. 



-^ 



CYLINDER 



C=vdh 



4ir 



FRUSTUM OF CYLINDER 



h = $ sum of greatest and least heights T- 



S=xdJj+-d2+area of elliptical top 



V**Ah = *ffih 

 4 



