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k=√(81/36)=√(9/4)=3/2=1,5 (C)
70.
a1=√36=6cm
a=a1/k=6/(1/2)=12
O=4*a=4*12=48cm (B)
71.
a1=√49=7cm
a=a1/k=7/3
O=4*a=4*7/3=28/3=9 1/3cm (C)