math

ive been working on my sat's and i cant seem to figure out how to answer the following question.

a right angle is given. the length of ba is 20. what is the approx length of bc?
sin= .643
cos= .766
tan= .839

the answer is 12.9 but i don't know how that is.

I assume bc is the other leg, and ba is one leg.

Isnt Sin of the base angle= bc/ba?

then bc= .643*ba

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