1)P=4*2/5=8/5=1,6 см S=8/5^2=1,6^2=64/25=2,56 см^2 2)P=4*4/5=16/5=3,2 см S=16/5^2=3,2^2=256/25=51,2 см^2 3)P=4*3/10=12/10=1,2 см S=12/10^2=1,2^2=144/100=1,44 см^2 4)11/4:1000=11/4*1/1000=11/4000 см P=4*11/4000=11/1000=0,011 см S=11/1000^2=0,011^2=121/1000000=0,000121 см^2
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Verified answer
P=4aS=a^2
1)P=4*2/5=8/5=1,6 см
S=8/5^2=1,6^2=64/25=2,56 см^2
2)P=4*4/5=16/5=3,2 см
S=16/5^2=3,2^2=256/25=51,2 см^2
3)P=4*3/10=12/10=1,2 см
S=12/10^2=1,2^2=144/100=1,44 см^2
4)11/4:1000=11/4*1/1000=11/4000 см
P=4*11/4000=11/1000=0,011 см
S=11/1000^2=0,011^2=121/1000000=0,000121 см^2