Odpowiedź:
1.
P = 2 (3*1+3*3+1*3) = 2(3+9+3) = 2*15 = 30cm2
2.
P = 2(1*3+1*5+3*5) = 2(3+5+15) = 2*23 = 46cm2
3.
P = 2(2*2+2*4+2*4) = 2(4+8+8) = 2*20 = 40cm2
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