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2*(3*8) + 2*(3*5) + 2*(8*5)= 48 cm2 + 30 cm2 + 80 cm2 = 158 cm2
b
2*(0,6*1,5) + 2*(0,6*2,3) + 2*(1,5*2,3) = 1,8 m2 + 2,76m2 + 6.9m2 = 11,16 m2
b = 8cm
c = 5cm
P = 2ab + 2bc + 2ac
P = 2 x 3 x 8 + 2 x 8 x 5 + 2 x 3 x 5
P= 2 x 24 cm + 2 x 40 cm + 2 x 15 cm
p= 48 cm + 80 cm + 30 cm
P = 158 cm²
a = 0,6m
b = 1,5m
c = 2,3m
P = 2 x 0,6 x 1,5 + 2 x 1,5 x 2,3 + 2 x 0,6 x 2,3
P = 2 x 0,9 m + 2 x 3, 45 m + 2 x 1,38 m
P = 1,8m + 6,90 m + 2,76 m
P= 11,46m²