Question

If the area of the circle is 1386 mm2

, its radius is _____.​

Answer 1

Answer:

it is your correct answer

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Answer 2

Answer:

21 cm .

Step-by-step explanation:

The Area of a circle of radius r

$= \pi \: {r}^{2} = 1386 \: {cm}^{2}$

$= \frac{22}{7} \times {r}^{2} = 1386 \: {cm}^{2}$

${r}^{2} = 441 \: cm$

Hence ,

$r \: = 21 \: cm$