Question

The area of a circle is 15400 m². Find its Circumference.​

Answer 1

Answer:

As we know that

Area of circle with radius r is πr  

2

 

Let the radius of the circle be r cm

Given Area of a circle is 15400 cm  

2

 

⟹πr  

2

=15400

⟹  

7

22

​  

×r  

2

=15400

⟹r  

2

=(70)  

2

 

⟹r=70

As we know that  

Circumference  of circle with radius r is 2πr

So circumference of circle is 2π(70)=2×  

7

22

​  

×70=440 cm

cm

Answer 2

Step-by-step explanation:

area of circel=15400

πr^2=15400

r^2=15400/π

r^2=15400/3.14

r^2=4904.4586

r=√4904.4586

r=70.0318

circumference of a circle = 2πr

=2*3.14*70.0318

so, circumference of a circle=439.8373 cm