[tex]P_p = 4cm * 3cm = 12cm^2[/tex]
[tex]P_1 =P_2= 10cm * 4cm = 40cm^2[/tex]
[tex]P_3 = P_4= 10cm * 3cm = 30cm^2[/tex]
[tex]P_b = 40cm^2 + 40cm^2 + 30cm^2 + 30cm^2 = 140cm^2[/tex]
[tex]P_pc = 2 *P_p + P_b = 2 * 12cm^2 + 180cm^2 = 24cm^2 + 180cm^2 = 204cm^2[/tex]