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72 / 12 = 6 cm
Pc = 6³ = 216 cm²
b)
72 / 9 = 8 cm
Pc = ¼ * 8²√3 + ¼ * 8²√3 + 3*8*8 = 32√3 + 192 cm ²
c)
72 / 18 = 4 cm
Pc = 12 * ¼ 4²√3 + 6*4*4 = 48√3 + 96 cm²