MathDB
cut a right triangle into 3 isosceles (2018 Kyiv City MO Round2 9.1)

Source:

September 14, 2020
geometryisoscelesright triangle

Problem Statement

Cut a right triangle with an angle of 30o30^o into three isosceles non-acute triangles, among which there are no congruent ones.
(Maria Rozhkova)