# Hand-in-hand model in square (edges and diagonals)

2022-06-16 By Hand in hand model in square (side and diagonal) Hand in hand model definition:Refers to two isosceles triangles (or equilateral triangles or isosceles right triangles or squares, etc.) with common vertices, rotated around their vertices, two triangles formed by the corresponding sides of the two isosceles triangles (or equilateral triangles or isosceles right triangles or squares, etc.), which must be similar.Features: Because the four edges connected by the vertices can be visualized as two hands, it is often called the hand-in-hand model.Three conditions for the hand-in-hand model: 1: common vertices 2: isosceles (equilateral, square, etc., in other words, the two sides of common vertices are equal) 3:Hidden line segments CD, AD, FE and FG with equal vertex angles, the square is transformed into an isosceles right triangle, which rotates around an Angle of 45°. The conclusion is still valid.Analysis of key points: (3) by the Pythagorean theorem get click to enjoy the wonderful video