69 
0 Ter AE (ec) (rn) 
if namely we put 
p = cos”! ze 
Lr 
It is evident from the preceding that the first factor is the rational 
area of AMBD. With a view to the equation 
PQ PQ, SQ 
EQ 8Q°* EQ 
the And factor will indicate the rational area of AMBP. 
TN 
lim n(=5) oa (2: «) ie) 
Extended over the quadrant AMC the multiplical becomes: 
e2, Er CEP - 
so that holds for sector BMC: 
L 
C cos — 
. 
Vr) Eru: 
wu is the “rational angle” mentioned before. For this holds: 
Bm ira = ete ale my 
furthermore, we must notice: 
u=tan Ir (y | a) = cos Ir (w-| 7) = sin Ir (y | 7). 
If the radius of the logarithmic circle is e then holds; 
PBMC) = a. 
