4. If the radius of a cylinder is doubled and its curved surface area is not changed, the height must be halved. 4. If the radius of a cylinder is doubled and its curved surface area is not changed the height must be halved. July 3, 2021 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related