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b=21
c=?
a²+b²=c²
28²+21²=c²
784+441=c²
1225=c²
√1225=c
35=c
35/2.5=14cali
x^2=28^2 + 21^2
^2 oznacza do kwadratu
x^2=784+441
784+441=1225pod pierwiastkiem
1225pod pierwiastkiem = 35
35/2,5=14cali