Radius (r1) of upper circular end of frustum part = 18/2 = 9 cm
Radius (r2) of lower circular end of frustum part = Radius of circular end of cylindrical part = 8/2 = 4 cm
Height (h1) of frustum part = 22 − 10 = 12 cm Height (h2) of cylindrical part = 10 cm
Slant height (l) of frustum part
Area of tin sheet required = CSA of frustum part + CSA of cylindrical part