a² = 6²+6²-2*6*6cos120
a = 6√(3) units.
tanb = 3/(6√(3))
b = atan(2/(2√(3)))
b = 16.102113752°
c = 90-16.102113752
c = 73.897886248°
d = 30+16.102113752
d = 46.102113752°
It implies;
cos46.102113752 = e/6
e = 4.1602514717 units.
Therefore, area blue is;
0.5*4.1602514717*6sin73.897886248
= 11.9911209755 square units.
≈ 12 square units.
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