May be 11.84768784
surface area is 2pir^2+pirl which is maximum if r=l Hence surface=3pi*r^2=6pi giving r=sqrt(2) and maximum vol=(4/3)pi*(1.4142)^3
A certain right pyramid with a square base has the same numerical surface area as its volume. If it is also the only right pyramid with a square base to have that certain surface area and volume, what is its height?
A hemispherical is made of steel, 0.25cm thick. The inner radius of the bowl is 5 cm. find the outer curved surface area of the bowl and also find the total surface area and volume.