Question

if the area of a circle is 13.86 square centimetre find its circumference
(Please answer step by step)​

Answer 1

Answer:

Area of a circle of radius r =πr

2

=1386cm

2

7

22

×r

2

=1386cm

2

r

2

=441cm

2

r=21cm

Circumference of a circle of radius r =2πr

Circumference of circle of radius 21cm=2×

7

22

×21=132cm

Answer 2

given,

area =13.86 square cm

area of circle=13.86

πr^2 = 13.86

(22÷7)×r^2 =13.86

r^2=(13.86×7)÷22

r^2=97.02÷22

r^2=4.41

r =√4.41

r =2.1 cm

cicumference of circle =2πr

=2×(22÷7)×2.1

=13.2

therefore,circumference of the given circle is 13.2 cm