If the area of a circular garden is 15400m², then it's perimeter is?

Solution: As we know that

Area of circle with radius r is πr²

Let the radius of the circle be r meter

Given Area of a circle is 15400m²

⟹πr² = 15400

⟹ 22/7 × r² = 15400

⟹r² = (15400×7)/22

⟹r=70

As we know that 

Circumference of circle with radius r is 2πr

So circumference of circle is 2π(70)=2×(22/7)×70=440 

Therefore, the perimeter of circular garden is 440m.