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OpenStudy (anonymous):
I think that answer is A?
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OpenStudy (anonymous):
OpenStudy (anonymous):
tg30º=DB/BC so DB=BCsqrt(3)/3 = 12sqrt(3)/3=4sqrt3 tg45º=AB/BC so AB= BC = 12 then: AD=AB-DB =12-4sqrt3 = 5,1
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