a=16, h₁=9, h₂=12
s=a*h₁=b*h₂ ⇒b=a*h₁/h₂=16*9/12=12
P=2*(a+b)=2*(16+12)=56
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a=16, h₁=9, h₂=12
s=a*h₁=b*h₂ ⇒b=a*h₁/h₂=16*9/12=12
P=2*(a+b)=2*(16+12)=56