Question

A circular lawn is uniformly 7meters wide and its inner edge is 440 meters . calculate the radius of the inner circle and the area of the lawns.

Answer 1

hiii!!!

here's ur answer...

given that the edge of inner circle is 440m

therefore circumference of inner circle in the lawn is 440m

=> 2πr = 440m

=> 2×22/7×r = 440m

=> 44/7×r = 440m

=> r = 440/1×7/44

=> r = 10×7

=> r = 70m

VERIFICATION:-

circumference of inner circle = 2πr

= 2×22/7×70

= 44×10

= 440m

hence verified

thus the radius of the inner circle is 70m.

total radius of the lawn = 70+7

= 77m

area of the lawn = πr²

= 22/7×77×77

= 22×11×77

= 18634m²

sorry, but not sure about the answer...