Question

the area of a circle is 1386 sq.cm find it's circumference

Answer 1

Area of circle = πr² = 1386 cm²

πr² = 1386 

22/7 x r² = 1386 

2/7 x r²   = 126 

r²/7         = 63 

r²            = 441 

r =  21 cm 

circumference = 2πr = 2 x 22/7 x 21 = 44 x 3 = 66 x 2 = 132 cm 

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Answer 2

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$area \: of \: the \: circle \: = 1386 {cm}^{2} \\ \pi {r}^{2} = 1386 \\ \frac{22}{7} \times {r}^{2} = 1386 \\ {r}^{2} = \frac{1386 \times 7}{22} \\ {r}^{2} = 441 \\ r = \sqrt{441} \\ r = 21 \: cm$