Answer: C) 11.5
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Use the sine rule since we have an unknown opposite side (x) and a known hypotenuse (20). The sine function is the ratio of the opposite over the hypotenuse.
sin(angle) = opposite/hypotenuse
sin(35) = x/20
20*sin(35) = (x/20)*20 .... multiply both sides by 20
20*sin(35) = x
x = 20*sin(35)
x = 11.4715
x = 11.5
