Question

A circular park has a path of uniform width around it. The difference between the outer and inner areas of the circular park is 132 m² and its width is 3.5 m, then the radius of inner circular park is​

Answer 1

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Given, 

2πr2−2πr1

= 132

⇒r2−r1 = 132/2π

= 132×7/44m

=21m

i.e., width of the path =21m