[tex]a)a = 3dm \: \: b = 2m = 20dm \\ p = 3 \times 20 = 60dm {}^{2} \\ ob = 2 \times (3 + 20) = 2 \times 23 = 46dm \\ b)a = 1.5dm \\ p = 1.5 \times 1.5 = 2.25dm {}^{2} \\ ob = 4 \times 1.5 = 6dm \\ [/tex]
[tex]ob = 4 \times 1.5 = 6dm \\ c)a = 6cm \: \: b = 6 + 2 = 8cm \\ p = 6 \times 8 = 48cm {}^{2} \\ ob = 2 \times (6 + 8) = 2 \times 14 = 28cm[/tex]
[tex]d)a = 6cm \: \: b = 2 \times 6 = 12cm \\ p = 6 \times 12 = 72cm {}^{2} \\ ob = 2 \times (6 + 12) = 2 \times 18 = 36cm {}^{2} [/tex]
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