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Pp= 20x20^3/4 cm2 = 400^3/4
Pp=100^3cm
Pc= 3x20cm x 5^3cm + 2x100^3cm2 = 300^3cm + 200^3cm2 = 500^3cm2
b) Pp = 20cm x 20cm = 400cm2
Pb = 4x 20cm x 5^3cm = 400^3cm2
Pc = 2x400cm2 + 400^3cm2 = 800cm2 + 400^3cm2
c) Pp = 6 x a2^3/4
Pp = 6 x 400^3cm2/4
Pp = 6 x 100^3cm2 = 600^3cm2
Pb = 6x 20cm x 5^3cm = 600^3cm2
Pc = 2x 600^3cm2 + 600^3cm2 = 1200^3cm2 + 600^3cm2 = 1800^3cm2