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a=3√5 cm
b=4√15 cm
P=ab
P=3√5*4√15=12√(5*15)=12√75)=12√(25*3)=12*5√3=60√3 cm²
2.
P=a²
a²=6400 cm²
a=√6400
a=80cm
O=4a
O=4*80cm=320cm