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d=4.2
r=2.1
area of 1st circle= πr^2
=22/7×2.1×2.1
=22/7×4.41
=13.86m^2
area of 2nd circle =9×13.86=124.74m^2
πr^2 = 124.74
22/7×r^2=124.74
r^2=124.74×7/22=39.69
r=√39.69
r=6.3m
d=12.6
circumference of circle = πd
=22/7×12.6
=39.6m
r=2.1
area of 1st circle= πr^2
=22/7×2.1×2.1
=22/7×4.41
=13.86m^2
area of 2nd circle =9×13.86=124.74m^2
πr^2 = 124.74
22/7×r^2=124.74
r^2=124.74×7/22=39.69
r=√39.69
r=6.3m
d=12.6
circumference of circle = πd
=22/7×12.6
=39.6m
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Answered by
1
39.6 is the answer............
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