Given: Length of rectangle =180m Breadth of rectangle =120m Area between circle and rectangle =40000m2 Area of rectangle = Length × Breadth Area of circle =πr2 According to the question, Area of the circle − area of rectangle =40000 ⇒πr2−(120×180)=40000 ⇒
22
7
r2=40000+21600=61600 ⇒r2=
7
22
×61600=19600 ⇒r2=(140)2 ⇒r=140 ∴ The radius of the circle is 140m .