Let b = 1 unit.
(1/sin72) = (a/sin48)
a = 0.78138871113 units.
BD = 1-0.78138871113
BD = 0.21861128887 units.
(AD)² = 1+0.21861128887²-2*0.21861128887cos60
AD = 0.91059299731 units.
Calculating the required angle x.
(0.91059299731/sin60) = (0.21861128887/sinx)
x = 12°
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