11. If a line is drawn parallel to the base of an isosceles triangle to intersect its equal sides, prove that the quadrilateral so formed is cyclic. 11. If a line is drawn parallel to the base of an isosceles triangle to intersect its equal sides prove that the quadrilateral so formed is cyclic. July 2, 2021 Category: Chapter 10 - Circles , Maths , NCERT Class 9 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related