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b = h = 4 cm
H = 8 cm
Pc = 2Pp + Pb
Pp = a*b/2 = 3*4/2 = 6 cm2
Pb = a*H + b*H + c*H = H(a + b + c)
Pb = 8(3 + 4 + 5) = 8*12 = 96 cm2
Pc = 2*6 + 96 = 108 cm2
Pc = 108 cm2
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