Let BC be 1 unit.
a = 180-30-18
a = 132°
a is angle BDC.
(1/sin132) = (b/ sin18)
b = 0.41582338164 units.
b is BD.
c = 180-72
c = 108°
c is angle BAC.
(1/sin108) = (d/sin36)
d = 0.61803398875 units.
d is AB.
(AD)² = 0.61803398875²+0.41582338164²-2*0.61803398875*0.41582338164cos6
AD = 0.20905692653 units.
Calculating x.
(0.20905692653/sin6) = (0.41582338164/sinx)
x = 12°
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