Question

The area of a circle is.1386 sq cm. what is the circumference of the circle

Answer 1

Heya !!

Here's your answer.. ⬇⬇
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Area of circle = 1386 cm²

πr² = 1386

22/7 × r² = 1386

1/7 × r² = 1386/22

1/7 × r² = 63

r² = 63 × 7

r² = 441

r = √441

r = 21 cm

Circumference of circle = 2πr
= 2 × 22/7 × 21
= 132 cm
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Hope it helps..
Thanks :)

Answer 2

Hey Mate!

Given,

Area of circle = $\pi \: {r}^{2}$= 1386sq.cm

$\pi \: {r}^{2} = 1386 \\ \\ \frac{22}{7} \times \: {r}^{2} = 1386 \\ \\ 22 \times {r}^{2} = 1386 \times 7 \\ \\ {r}^{2} = \frac{1386 \times 7}{22} \\ \\ {r}^{2} = 63 \times 7 \\ \\ r = \sqrt{441} \\ \\ r = 21cm$

Circumference of circle = pi d

= 22/7 × 42

= 22 × 6

= 132

HOPE THIS HELPS U...