The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum. The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum. October 6, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 10 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related