из свойств биссектрисы AD/AB = DC/BC
AD = 8*AC/(8+12)
Sabc = 8*12*sin(30)/2= 96/4 = 24=AC*h/2
h = 24*2/AC
Sadb = AD*h/2 = 8/20*AC*48/AC*1/2 = 9.6
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из свойств биссектрисы AD/AB = DC/BC
AD = 8*AC/(8+12)
Sabc = 8*12*sin(30)/2= 96/4 = 24=AC*h/2
h = 24*2/AC
Sadb = AD*h/2 = 8/20*AC*48/AC*1/2 = 9.6