A proof without words Nov 23, 2020 Via nRICH: A circle touches the lines OA extended, OB extended and AB where OA and OB are perpendicular. Show that the diameter of the circle is equal to the perimeter of the triangle. $\blacksquare$ A selection of other posts Jun 14, 2021 An iterative wrinkle Jul 22, 2019 A logs puzzle Apr 2, 2018 Sprinkle on the sugar, eat the lot Jul 24, 2017 The Return Of The Cav subscribe via RSS