Two cones with same base radius 4 cm and height 8 cm are joined together along their bases. Find the surface area of the shape so formed.
each cone has area
πrs
where
r = 4
s^2 = r^2+h^2 = 16+64 = 80
πrs
where
r = 4
s^2 = r^2+h^2 = 16+64 = 80