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mtkdnee
@mtkdnee
April 2022
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coloquem a resolução da conta pf
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AltairAlves
Verified answer
Aplicando a fórmula:
x² = 3² + 4² - 2 . (3) . (4) . cos 120° (cos 120º = -1/2)
x² = 9 + 16 - 24 . (-1/2)
x² = 25 - 24 . (-1/2)
x² = 25 + 12
x² = 37
x = √37
cm
Alternativa correta:
Letra "d"
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Verified answer
Aplicando a fórmula:x² = 3² + 4² - 2 . (3) . (4) . cos 120° (cos 120º = -1/2)
x² = 9 + 16 - 24 . (-1/2)
x² = 25 - 24 . (-1/2)
x² = 25 + 12
x² = 37
x = √37 cm
Alternativa correta: Letra "d"