sin А=21/29
cos A = √ (1 – sin^2 А) = √ (1 – (21/29)^2 ) = 20/29
tg A = sinA / cosA = (21/29) / (20/29) = 21/20
AB = AC/cosA = 40/(20/29)= 58 см
СВ = AC*tgA = 40*21/20 = 42 см
ответ: АВ= 58 см, СВ= 42 см.
sin А=21/29
cos A = √ (1 – sin^2 А) = √ (1 – (21/29)^2 ) = 20/29
tg A = sinA / cosA = (21/29) / (20/29) = 21/20
AB = AC/cosA = 40/(20/29)= 58 см
СВ = AC*tgA = 40*21/20 = 42 см
ответ: АВ= 58 см, СВ= 42 см.