Odpowiedź:
a)
[tex]p = 3 \times (3cm \times 6cm) = 3 \times 18 {cm}^{2} = 54 {cm}^{2} [/tex]
b)
[tex]p = 12cm \times (6cm + 8cm + 10cm) = 72 {cm}^{2} + 96 {cm}^{2} + 120 {cm}^{2} = 288 {cm}^{2} [/tex]
c)
[tex]p = 6 \times (10cm \times 4.2cm) = 6 \times 42 {cm}^{2} = 252 {cm}^{2} [/tex]
