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a=4x
b=9x
P=ab
4x*9x=62 500
36x² =62 500 /:4
x²=15 625/9
x=√15 625/√9
x=125/3 m
a=4*125/3
a=500/3 m
b=9*125/3
b=1125/3 m
o=2(a+b)
O=2(500/3 +1125/3)
O=2*1625/3
O=3250/3
O=1083 1/3 m