Respuesta :

SchooledBoy
The radius of circle a is 5
SJ2006

Let, area of circle a = a   and of b = b

A.T.Q,

36a = b

36a = 30

a = 30/36 = 5/6

πr² = 5/6

r² = 5/6π

r = √5/√6π

You can calculate that further by putting the value of π

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