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n= 4cm
r = 3 cm <mozesz wybrac inne dl>
a) 1/2 * 3= 1,5 cm
b) 1/4 * 6 + 2*3 = 1,5 + 6 = 7,5 cm
c) 1 i 3/4 * 6 + 1,5 + 7,5 = 10,5 + 1,5+7,5 = 19,5 cm
:)