VOLUMES OF SOLIDS. 



breadth, and depth in linear units. The same principle 

 applies to solids whose cross-section does not vary. In 

 such solids (figs. 6 and 7) the perpendicular distance of 

 two opposite equal sides is to be taken as the length. 

 Thus the volume of the solid represented in fig. 6 is 



7 is 2 x 2 x 3*1416 x 5 = 



62 >CC 832. (The abbreviations cc., m., c., etc., are written 

 at the top, between the integer and the decimal fraction ; 



Fio. 6 (an* prey, real size)* 



FIG. 7 (an. prey, real size). 



read : sixty-two, and eight-hundred and thirty-two 

 thousandths cubic centimetres). 



The volume of a sphere is found by multiplying the 

 diameter twice by itself, and by 3*1416, and dividing the 

 product by 6. Thus the volume of a sphere of 10 CBft 



diameter is 



10 x 10 x 10 x 3-1416 



= 523- cc 6. The cor- 



responding units for the measurements of lengths, areas, 

 and volumes clearly bear different proportions to each 

 other. Thus the square metre is a rectangle of 100 cm 



