Sabc = ab*bc*sinb\2
sinb = 1\2
Sabc = 5 см^2
Sa1b1c1 \ S abc = k^2 = 9
Sa1b1c1 = 5*9 = 45см^2
ответ: 45см^2
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Sabc = ab*bc*sinb\2
sinb = 1\2
Sabc = 5 см^2
Sa1b1c1 \ S abc = k^2 = 9
Sa1b1c1 = 5*9 = 45см^2
ответ: 45см^2