Question

If the area of circle is 75.44 sq cm .then what is the circumfrence of circle

Answer 1

Here i take 'ㅠ' value as 3.14
( you can also use 'ㅠ' value as 22/7)

area of the circle = ㅠr^2

75.44 = 3.14 × r^2

75.44/3.14 = r^2

24.025 = r^2

$r = \sqrt{24.025}$
r= 4.9 cm

circumference of the circle = 2ㅠr

=> 2 × 3.14 × 4.9

=> 30.77 cm