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L=2(a+b)
P=40cm2
a=8cm
b=40cm2/8cm=5cm
L=2*(8cm+5cm)=2*13cm=26cm
a=8cm
b=?
P=40cm²'
40=8b/:8
b=5(cm)
Ob=5×2+8×2=10+16=26
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