Answer:
Step-by-step explanation:
take 60 degree as reference angle
using cos rule
cos 60=adjacent/hypotenuse
1/2=80/x(do cross multiplication)
80*2=x
160=x
x = 160
Using the cosine ratio in the right triangle
cos60° = = = ( multiply both sides by x )
x × cos60° = 80 ( divide both sides by cos60° )
x = = 160
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A
Answer is A.
Hope this helps.