sin∟B = AC/AB = 5/13
cos∟B = √1- sin^2∟B = √ 1 - 25/169 = √ 144/169 = 12/13
tg ∟B = sin∟B/cos∟B = 5/12
sin∟B = AC/AB = 5/13
cos∟B = √1- sin^2∟B = √ 1 - 25/169 = √ 144/169 = 12/13
tg ∟B = sin∟B/cos∟B = 5/12