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 degrees. Prove that this trapezoid is isosceles.