find the radius of a circle whose area is 1386 square CM
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area of circle=πr^2
1386=πr^2
1386=22/7×r^2
1386×7/22=r^2
441=r^2
21=r
1386=πr^2
1386=22/7×r^2
1386×7/22=r^2
441=r^2
21=r
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