M mark10245 New member Joined Dec 10, 2014 Messages 2 Dec 10, 2014 #1 Hi! I need with this task: Given a tetrahedron ABCD, where <) ACB = <) ADB = 90◦ and AC = CD = DB. Prove that AB <2 · CD. Could you please explain it to me? Last edited by a moderator: Dec 11, 2014
Hi! I need with this task: Given a tetrahedron ABCD, where <) ACB = <) ADB = 90◦ and AC = CD = DB. Prove that AB <2 · CD. Could you please explain it to me?
