Verified Answer :

wolf1728

Those are two 30 60 90 triangles with a common side.
In the left triangle, x = 8 sq root (3) / 2=
.758 = 6 (approximately)

sine (30) = opp/hyp = x/y =
.5 = [8sq root (3) / 2] / y
y = [8sq root (3) / 2] / .5
y = 8*sq root (3)
y = 12 (approximately)

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