proszę o całe rozwiązania;)
b)
P=16πm²
P=πr²
πr²=16π m² /:π
r=√16=4m
l=2π·4=8πm
P=4/9 π cm²
4/9π=πr² /;π
r=√4/9=2/3
l=2 ·2/3 π=4/3π =1⅓ πcm
P=0,25π mm²
0,25π=πr² /:π
r²=0,25
r=√0,25=0,5mm
l=2πr=2·0,5π=1π=π mm
P=2πdm²
πr²=2π /:π
r=√2dm
l=2π·√2=2√2πdm
P=3km²π
πr²=3π /:π
r=√3km
l=2√3π km²
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b)
P=16πm²
P=πr²
πr²=16π m² /:π
r=√16=4m
l=2π·4=8πm
P=4/9 π cm²
4/9π=πr² /;π
r=√4/9=2/3
l=2 ·2/3 π=4/3π =1⅓ πcm
P=0,25π mm²
0,25π=πr² /:π
r²=0,25
r=√0,25=0,5mm
l=2πr=2·0,5π=1π=π mm
P=2πdm²
πr²=2π /:π
r=√2dm
l=2π·√2=2√2πdm
P=3km²π
πr²=3π /:π
r=√3km
l=2√3π km²