Question

The rope required to measure the diameter of a circular pond is 90 m shorter than measuring the circumference

Answer 1

Step-by-step explanation:

diameter,d =2*r where r -> radius

circumference,c = 2πr

Here d+90 = 2πr

=> 2πr-2r = 90

=> 2r(π-1) = 90

=> r = 45/(22/7 -1)= 45*7/15 = 21m

so d = 42 m and circumference = 42+90= 132m