find sin A
a 4/5
b 5/4
c 3/5
d 5/3
e 3/4
f 4/3

Answer: 4/5 (first choice)
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Work Shown:
sin(angle) = opposite/hypotenuse
sin(A) = BC/AC
sin(A) = 24/30
sin(A) = (6*4)/(6*5)
sin(A) = 4/5