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r²=25
r=√25=5cm
L=2πr=2·5π=10πcm
b)16/49 π =πr² /:π
r²=16/49
r=4/7
l=2πr=2π·4/7=8π/7 cm
c)5=πr²
r²=5/π
r=√(5/π)=√5/√π=√(5π)/π
L=2πr=2π·√(5π)/π=2√(5π) cm