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225+ 400= x do kwadratu
625= x do kwadratu
25= x
x= 25 x- przeciwprostokątna
tg alfa= 15/ 20 = 3/4
ctg alfa= 20/ 15= 4/3= 1i 1/3
tg beta=20/ 15= 4/3
ctg beta= 15/20= 3/4