86 ON HEXAGONAL FACETS IN A CIRCLE. 
ExaMPLe 1. 
N = 164 
9 
—N?= 24206 
10 : 
H = 20091 
9 
C=—N?—H = 4115 
io 1 
(c-H) (aN De are 
1 
.-S=C a (C — H) =24206 — 1028 = 23178. 
S as found by § (VII) = 23228. 
Error == 50. 
EXAMPLE 2. 
N=" 10 
C= /90 
ise 
4|19 
il 
2 Ek 
{(¢—) 
S=H+4=75. 
Which number will be found correct by mspection of fig. 2. 
EXAMPLE 3. 
ee Oe eos 
n = 34 
38n = 102 
H =8n.n+1+1= 8571 
1 
C—H = 4284 — 8571 = 718... 7(C — H) = 178 
gy “(C — H) = 4284 — 178 = 4106 =S. 
