Let a be 1 unit.
(1/sin48) = (b/sin24)
b = 0.54731813925 units.
(1/sin48) = (c/sin108)
c = 1.27977277603 units.
DC = 1.27977277603+0.54731813925+1
DC = 2.82709091528 units.
Therefore, the required angle x is;
(2.82709091528/sin36) = (1/sinx)
x = 12°
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