An application for the study of similar polygons

Move the polygon ABCD or A'B'C'D' and place it over the other polygon.[br]Move points A, B, C or D to change the format of the quadrilateral (or triangle) ABC (D).[br]Move the points Z or I to change the format of equiangular quadrilateral EIHZ.[br]Change the cursor λ to change the ratio of similarity of polygons.