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Answer:
sin(A) = BC/BA
Step-by-step explanation:
There is no indication in the figure posted here that triangle XYZ has any relevance to the question.
Sin = Opposite/Hypotenuse
sin(A) = BC/BA
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If triangle ABC ~ triangle XYZ, then ...
sin(A) = BC/BA = YZ/YX = 6/10 = 3/5
