•4^.1 ) 52 ( |c^<* 



Menfura angulorum folidorum 



Icofaedri. 



§. 59. Cum hic angulus folidus ex quinis angu- 

 lis planis a zz 60° componatur, erit ^0 — 30" et n — 5 ., 

 vnde ex coroll. 3 calculum ita inftitui opportct: 



/cof. 36° = 9,9079575 



/cof. 30 =:9^937530<^ 



/ fin. (p =19,9704270 



vnde colligitur <pz:69°. s'.^!^", ergo ioC|)r:690'. ^6'. 55"; 

 hinc anguli folidi Icofaedri menfura erit S = x^o". 56'. 55'', 

 qui ergo angulus iam valde eft obtufus. 



Menfura angulorum folidorum 



Hexaifdri. 



§. 40, Cum hic finguli anguli folidi confteut ter- 

 nls angulis planis redis, erit ^ = 90% 5^^:45°, et »i:3j 

 hinc ex Coroll. i. calculus ifta inftituatur: 



/ cof. 60° zz 9, 6989700 

 / cof. 45° =1 9, 8494850 



/fin. Cj) =: 9,8494850 

 ideoquc fit Cp=:45°, ergo tfCj^rrs^o*; vnde menfura an- 

 guli folidi Hcxaedri erit 90°, fcilicet hic anguUis iple eft 

 redtus. 



Menfura angulorum folidorum 



Dodecaedri. 



§. +1. Cum hic quilibet angulus conftct ex ter- 



nis 



