угол С=180-40-75=65
Затем по теореме синусов
АС/sinB=CB/sinA
24/sin75=CB/sin40
СВ=(24*sin40)/sin75
CB=(24*0.64)/0.96=16 (см)
S=1/2*AC*CB*sin65
S=1/2*24*16*0.9=12*16*0.9=172.8см2
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угол С=180-40-75=65
Затем по теореме синусов
АС/sinB=CB/sinA
24/sin75=CB/sin40
СВ=(24*sin40)/sin75
CB=(24*0.64)/0.96=16 (см)
S=1/2*AC*CB*sin65
S=1/2*24*16*0.9=12*16*0.9=172.8см2