Using heron's formula,we know that Ar=root of [s(s-a)*(s-b)*(s-c)] where s=(a+b+c)/2 AND a,b and c are the measures of the sides
Ar. of triangle= root of [32*7*7*18]=168
we know that - 'in an isosceles triangle altitude is also the median AND the center of the circle divides the median in to the ratio 2:1'
in this case 2x will be the radius of the circle
hence the radius of the circle=2x=8cm