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7x= 3,5 cm / :7
x= 0,5
Boki:
13× 0,5 cm= 7,5 cm I bok
12× 0,5 cm= 6 cm II bok
5 × 0,5 = 2,5 cm III bok
Obw. = 7,5 + 6 + 2,5 = 16 cm
ale pole niestety nie wiem jak..