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LoginDia of Circle = d.
Area of Core/Area of Circle = 1/16 will get.
e=D/8(Radius of core)
area of column=(22/7)xD^2/4................Eq 1
area of core=(22/7)X r^2
area of core= 22/7x D^2/64.....................Eq2
now dividing eq1/eq 2
we get 16
Radius of core, r = D/8
Area of core = pi x r2 = pi x (D2)/64
Ratio , pi x D2/4 / pi x (D2)/64 = 64/4 =16