ТО^2 = 17^2 - 15^2 = (17-15)(17+15) = 2*32 = 64 ---> ТО = 8 (3V19)^2 = 15^2+OB^2-2*15*OB*cos(60°) 171-225 = OB^2 - 15*OB OB^2 - 15*OB + 54 = 0 по т.Виета корни (6) и (9) 1) ОВ=6; ТВ^2 = 8^2+6^2; ТВ = 10 2) ОВ=9; ТВ^2 = 8^2+9^2; ТВ = V145
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ТО^2 = 17^2 - 15^2 = (17-15)(17+15) = 2*32 = 64 ---> ТО = 8 (3V19)^2 = 15^2+OB^2-2*15*OB*cos(60°) 171-225 = OB^2 - 15*OB OB^2 - 15*OB + 54 = 0 по т.Виета корни (6) и (9) 1) ОВ=6; ТВ^2 = 8^2+6^2; ТВ = 10 2) ОВ=9; ТВ^2 = 8^2+9^2; ТВ = V145