Question 312673
base area of pool = 85 sq. m
area = pi^r^2
r^2= area /pi
r=sqrt(area / pi)
radius = sqrt(85 / pi)
= 5.2 m
Area of wall = 2*pi*r*h
Area of the wall 9.8 
Area of wall + area of base=
5.2 + 9.8 = 15 sq. mt