Let BC be 1 unit.
a = 180-54-21-15-33
a = 57°
(1/sin57) = (b/sin(54+21))
b = 1.1517344989 units.
c = 180-21-33
c = 126°
(1/sin126) = (d/sin21)
d = 0.4429671466 units.
f² = 0.4429671466²+1.1517344989²-2*0.4429671466*1.1517344989cos15
f = 0.7328841114 units.
Therefore, the required angle, x is;
(0.7328841114/sin15) = (0.4429671466/sinx)
x = 9°
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