v9 
9 
re 
o x o » x 
(2) (b) 
Fig.7 
Tab.4 
x y 
A 84.25 282.96 
B 347.59 422.05 
e 222.26 120.86 
A' 185.77 105.37 
p' 46.38 368.17 
c 347.77 244.00 
Tab.5 
AB BC AC 
Dx 263.34 -125.33 138.01 
Dy 139.09 -301.19 -162.10 
Dx'| -139.39 301.32 161.93 
Dy’ 262.80 =124.17 132.63 
ol 90 04 42" 90 04 40" 90 04 28" 
average value of of 90 04 40" 
  
  
c -angle coordinate system is the 
expasion of plane rectangular coordinate 
system and plane rectangular coordinate 
system is the special case of plane 
d-angle coordinate system.The conclusions 
about plane a -angle coordinate system 
drawed in this paper are effective for 
plane rectangular coordinate system. It 
is believed that the conclusions will be 
used in other filedsof science. 
62 
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