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b 75 cm
c 9,6 cm
d 10 cm
Obw= 21cm
b) Obw= 25+25+25
Obw= 75cm
c) Obw= 3,2+3,2+3,2
Obw= 9,6cm
d) Obw= 3⅓+3⅓+3⅓
Obw= 10cm
;P