Question

find the circumferene of circle whose area is 1386m​

Answer 1

Question :

find the circumferene of circle whose area is 1386m

Answer :

$\sf\pink{Given}$

• Area of circle is 1386 m²

$\sf\pink{To\: Find}$

• Circumference of the circle = ?

Explanation :

$\sf\purple{Area \:of\: circle = πr²}$

$\longrightarrow\sf{1386 = \dfrac{22}{7}\times r²}$

$\longrightarrow\sf{1386\times \dfrac{7}{22} = r²}$

$\longrightarrow\sf{63\times 7 = r²}$

$\longrightarrow\sf{ 441 = r²}$

$\longrightarrow\sf{ \sqrt{441} = r}$

$\longrightarrow\sf\pink{ 21 = r}$

• Therefore radius is 21 m

$\sf\purple{Circumference = 2πr}$

$\longrightarrow\sf{2\times \dfrac{22}{7}\times 21}$

$\longrightarrow\sf{44\times 3}$

$\longrightarrow\sf\pink{132 m}$

• Therefore circumference is 132 m