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b)P=π·(0,2)²=π·0,04=3,14·0,04≈0,1256m²
c)P=π·10²=π·100=3,14·100≈314cm²
d)P=π·(1,1)²=π·1,21=3,14·1,21≈3,7994m²
e)V=2πr 2πr=3π/:2π r=3/2
P=π·(3/2)²=π·9/4=π·2,25=3,14·2,25≈7,065cm²
f)V=2πr 2πr=3π/4/:2π r=3π/4·1/2π r=3/8
P=π·(3/8)²=π·9/64=3,14·9/64≈14,13/32≈0,471m²
3a)P=16πcm² P=πr² 16π=πr²/:π r²=16 r=4cm
b)100πm²=πr²/:π r²=100 r=10m
c)0,04πdm²=πr²/:π r²=0,04 r=0,2dm
d)πkm²=πr²/:π r²=1 r=1km
e)9/16πmm²=πr²/:π r²=9/16 r=3/4mm