MathDB
On a circumscribed pentagon

Source: St. Petersburg MO 2001 Grade 9 Problem 3

March 1, 2023
geometrySt. Petersburg MOpentagoncircumscribed

Problem Statement

A convex pentagon ABCDEABCDE is given with AB=BCAB=BC, CD=DECD=DE and ∠A=∠C=∠E>90∘\angle A=\angle C=\angle E>90^{\circ}. Prove that the pentagon is circumscribed
[I]Proposed by F. Baharev
Back to ProblemsView on AoPS