155
D
1
100 * tan(111°55′47″/ 2) +1.7(1 / sin111°55′47″)
–
1.7(1 / tan
111°55′47″) +31.891
=148.06015 + 1.8326 + 0.6844 +31.891
=182.468
D
D
2
1
(7) Calculation of the coordinate KA1
1
1
1
1
cos
D
N
N
IP
KA
1
1
1
1
sin
D
E
E
IP
KA
Bearing from BP to IP1
1
74°03′16.6″
N
KA
1
1300
–182.468 * cos 74°03′16.6″=1249.872 m
E
KA
1
1750
–182.468 * sin 74°03′16.6″=1574.553 m
(8) Calculation of Arc Length
)
(
2
1
LA
R
L
=
R
(111°55′47″
-
2 * 18°20′06″)
=100( 75°15′35″
180
)
=131.353 m
(9) Calculation of the coordinate KA2
2
2
1
2
cos
D
N
N
IP
KA
2
2
1
2
sin
D
E
E
IP
KA
Bearing from IP1 to IP2
2
322°07′30.1″
N
KA
2
1300
–
(-
182.468) * cos 322°07′30.1″= 1444.032 m
E
KA
2
1750
–
(-
182.468) * sin 322°07′30.1″= 1637.976 m
(10) Calculation of coordinates BC
，
EC which is ARC (IP1,IP2,EP)
Arc length
IA
R
CL
IA=
95°52′11″
