MATHEMATICS 



53 



fc^q 



FRUSTRUM OF CYLINDER 



h = i sum of greatest and least heights 

 C = P h = irdh 



S = itdh + d 2 + area of elliptical top 



CONE 



4 3~ 3 ~12r 

 FRUSTUM OF CONE 



'4.1888r3 



SPHERE 



5 = nd* = 47rr 2 = 12.5664r 

 V = JJ3 = j ffr 3 = .5236cP 



CIRCULAR RING 



D = mean diameter; 



/? = mean radius. 



S = WRr = 9 . 8696Dd 



WEDGE 



PRISMOID 



A prismoid is a solid having two parallel plane ends, the 

 edges of which are connected by plane triangular or quadri- 

 lateral surfaces. 



