The area of circle is 1386msq find circumference
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area of circle = πr^2
1386 = πr^2
r^2 = 1386/π
r = √1386/π
so circumference is
2πr = 2 * π *√1386/π
= 2*3.14*√1386/3.14
= 6.28. * 21
= 131.9
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