324: APPENDIX CALCULATION OF THE 



RHOMBIC DODECAHEDRON. 



The symbol representing the upper plane belong- 

 ing to class by of the two on which b is placed, and 

 which rest on the edge between P and P", is 

 (B P B' q br b's)- 



Let the inclination of this plane on P be called I 7 



P" . / 8 



A spherical triangle will give the values of angles 

 corresponding to A^ and A 5 of the regular octa- 

 hedron, and from these, the particular values of p, 

 q, r, and s, may be deduced by the methods pointed 

 out in reference to the analagous decrements on that 

 form. 



Decrements on the edges. 



Let the inclination of plane P on one of the planes 

 k 9 adjacent to it, be called / 9 . 



and P = * 



5 sin. (180 I,) 



