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P=1/2 razy przekątne
a) 1/2 razy 24 = 12
b)1/2 razy 48 = 24
c)1/2 razy 20 = 10
d)1/2 razy 8√7 = 4√7
1.
a²=0,5²+2²
a²=0,25 + 4
a²=4,25 / √
a=0,5
Odp.Średnica kanalu wynosi 0,5