Triangle series

The triangle series has the fundamental purpose of lending itself to self-education in geometry exercises, as it offers the possibility of making an analytical study by measuring angles and thus defining that triangles are similar when they have all corresponding angles equal. Composed of a series of four tiles, the first tile contains a whole equilateral triangle with a side of 10 cm. In the other tiles, the triangle is divided into two by the height, three by the bisector of the angles, and four by the straight lines joining the central points of the sides.