2. Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m. 2. Find the total surface area of a cone if its slant height is 21 m and diameter of its base is 24 m. October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related