Height = root 12^2 - 6^2
= 6 root 3
Opposite = 6 root 3
X is hypotenuse
O + H = Soh or sin
Sin54 = 6root3 / x
Multiply by x, then รท Sin54
x = 6 root 3/Sin54
x = 12.845....
So, x is 12.8 cm to 1d.p
Hope this helps!
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