Toán Lớp 9: cho tam giác ABC tại A
CM ; AC/AB = sinB/sinC
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Toán Lớp 9: cho tam giác ABC tại A
CM ; AC/AB = sinB/sinC
Comments ( 2 )
sin hat B = {AC}/{BC}
sin hat C = {AB}/{BC}
=> sin hat B/sin hat C={AC}/{BC}: {AB}/{BC}
=> sin hat B/sin hat C={AC}/{BC}.{BC}/{AB}
=> sin hat B/sin hat C={AC}/{AB}
=> đpcm