AB^2 = BC^2 + CA^2
а) 40^2 + 42^2 = 1764 + 1600 = 3364 = 58 AB
б) 7.8^2 - 7.2^2 = 60.84 - 51.84 = 9 = 3 CA
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б)из под квадратного корня 7,8^2 - 7.2^2 =3
AB^2 = BC^2 + CA^2
а) 40^2 + 42^2 = 1764 + 1600 = 3364 = 58 AB
б) 7.8^2 - 7.2^2 = 60.84 - 51.84 = 9 = 3 CA