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h=8cm
b=2a
P=54
54=0,5(a+2a)8
54=4*3a
3a=13,5
a= 4,5
b= 9
P=(a+b)*h/2
a=2b
P=3b*h/2
b=2P/3h=108/24=4½
a=2b=9
a=4,5cm
b=9cm