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a²+b²=c²
12²+9²=c²
144+81=c²
c=√225
c=15
sinAlfa= a÷c
sinAlfa=12÷15
sinaAlfa=0,8 ( 53stopnie)
sinB=9÷15
sinB=0,6 ( 37 stopni)
81+ 144= c do kwadratu
225= c do kwadratu
c= 15
sin alfa= 9/ 15= 3/5
sin beta= 12/ 15= 4/5