Opposite Angles of a Cyclic Quadrilateral Posted on 2019/07/29 by Carl Robitaille Opposite Angles of a Cyclic Quadrilateral add up to 180 Degrees#MTBoS #iteachmath #math #maths pic.twitter.com/lUcOC1w36e— Idan Tal (@MagicPi2) July 29, 2019