Odpowiedź:
C
[tex]p = 2(3 \times 1.5 + 3 \times 4 + 1.5 \times 4) = 2(4.5 + 12 + 6) = 2 \times 22.5 = 45 \: {cm}^{2} [/tex]
D
[tex]p = 2(3.5 \times 20 + 3.5 \times 7 + 20 \times 7) = 2(70 + 24.5 + 140) = 2 \times 234.5 = 469 \: {cm}^{2} [/tex]
E
[tex]p = 2(10 \times 5 + 10 \times 25 + 5 \times 2.5) = 2(50 + 250 + 7.5) = 2 \times 307.5 = 615 \: {dm}^{2} [/tex]
F
[tex]p = 2(5 \times 5 + 5 \times 50 + 5 \times 50) = 2(25 + 250 + 250) = 2 \times 550 = 1100 \: {cm}^{2} [/tex]