Explanation:
Trig ratios for RIGHT triangles:
S-O-H-C-A-H-T-O-A
SOH stands for Sin = Opposite leg / Hypotenuse
so for this triangle sin 51 = x / 9
now rearrange to solve for 'x'
9 * sin 51 = x <=====now use a calculator to find x = 7
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