In fig. 6.7, AB, CD and EF are three lines concurrent at O. Find the value of y. AB CD and EF are three lines concurrent at O. Find the value of y. In fig. 6.7 June 30, 2021 Category: Chapter 6 - Lines and Angles , Maths , NCERT Class 9 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related