The radius of a circle is 3m .What is the circumference of another circle whise area is 49 times that of the first?
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Radius =3
area of circle =22/7×3×3=9×22
=198/7m^2
area of another circle =49×area of 1st circle
=49×198/7=1386m^2
area =22/7×radius ^2
1386=22/7×radius ^2
1386×7/22=radius ^2
63×7=radius^2
441=radius ^2
(21)^2=radius ^2
radius =21m
circumfence of this circle =22/7×21=66m
area of circle =22/7×3×3=9×22
=198/7m^2
area of another circle =49×area of 1st circle
=49×198/7=1386m^2
area =22/7×radius ^2
1386=22/7×radius ^2
1386×7/22=radius ^2
63×7=radius^2
441=radius ^2
(21)^2=radius ^2
radius =21m
circumfence of this circle =22/7×21=66m
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