CEXTSB or ORA\ 111 



solids are as the cubes of their homologous 



~DG-Dg-\ /)-i*; 



rcfore 



Also GF-\DF-\(DF- Df) y similar figures, 



a r * 



- JY7 - 0*0 - \ \. - -, 8 * 1 .. I 

 4 (a 6 a 1 6'j 



Uh 



F- 



f a frusttim of a pyramid on any base, a and b 

 tologous sides of the two ends. 



(7) We inn >ryof the centre of gravity 



. 



't join ti point* cf the oppotitf 



*//'> froJtedron meet at a point which bisects each 



ppoae equal particles placed corners of a 



u of gravity of the system 



we may proceed re of gravity of any pair 



edge wli 



of gravity of the other pair i n* 

 .e opposite edge: ivitr 



trai^ht !: 



ie selected edges. And the 



same ill of course be obtained for the centre of 



- system, whatever pair of edges be selected, 

 iuired result is obtaii 



