Write whether the following statements are true or false :
(ii) The radius of base , height and slant height of a solid right circular cone are r unit h unit and l unit respectively . The base of the cone is joint along the base of solid right circular cylinder. If the radii of the bases and heights of the cylinder and of the cone be equal , then the total surface area of the joint solid object will be `(pirl + 2pirh +2 pir^(2))` sq - unit

Explanation

Since the radius of the base of the cone is r unit and its slant height is l unit .
` :.` curved surface area = ` pi rl ` sq- unit
Again , the radius of the cylinder is r unit and height is h unit .
` :. ` the surface area of the solid object ` = (pi rl + 2pirh + pir^(2))` wq- unit