Задача Задача №746625
А
А
Cos A = (b^2 + c^2 - a^2) / 2bc = (196 + 225 - 169) / 420 = 0.95
Cos B = (a^2 + c^2 - b^2) / 2ac = (169 + 225 - 196) / 420 = 0.6
Cos C = (a^2 + b^2 - c^2) / 2ab = (169 + 196 - 225) / 420 = 0.45
Cos A = (b^2 + c^2 - a^2) / 2bc = (196 + 225 - 169) / 420 = 0.95
Cos B = (a^2 + c^2 - b^2) / 2ac = (169 + 225 - 196) / 420 = 0.6
Cos C = (a^2 + b^2 - c^2) / 2ab = (169 + 196 - 225) / 420 = 0.45
