1.

Find the circumference of a circle whose area is 1386 cm².(A) 132 cm² (B) 132 cm (C) 42 cm (D) 21 cm²

Answer» HEY dear
here is your answer

area of a CIRCLE =
\pi {r}^{2}
1386 \: = \pi {r}^{2}
1386 \: = 3.14 \times {r}^{2}
{r}^{2} \: = 441
r \: = 21 \: cm
now, CIRCUMFERENCE of a circle =
2\pi \: r
2 \times 3.14 \times 21 \: = 131.88 \: cm \\ = 132 \: cm
HOPE it HELPS :)


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