решение на фотографии.
DK² = 81+144=225
DK = 15
cosK = 12/15 / 4/5
sinK = 9/15 = 3/5
tgK = 9/12 = 3/4
ctgK = 12/9 = 4/3
решение на фотографии.
DK² = 81+144=225
DK = 15
cosK = 12/15 / 4/5
sinK = 9/15 = 3/5
tgK = 9/12 = 3/4
ctgK = 12/9 = 4/3