MathDB
isosceles trapezoid wanted (2023 Novosibirsk Oral Geo Oly 9.4)

Source:

September 4, 2023
geometrytrapezoidIsosceles Trapezoidisosceles

Problem Statement

In a trapezoid, the length of one of the diagonals is equal to the sum of the lengths of the bases, and the angle between the diagonals is 6060 degrees. Prove that this trapezoid is isosceles.