Didactical material for the calculation of areas of flat figures (Machine-translation by Google Translate, not legally binding)

摘要

Didactic material for the calculation of areas of flat figures, characterized by being constituted by a flat on which printed a circle of radius 30 units and a regular hexagon, and in which the unión of the vertices of the regular hexagon with the center of the circumference form equilateral triangles that have as side, the side of the hexagon and that form right triangular "base" triangles by the height tracing of the equilateral triangles of the upper part of the hexagon and extending until cutting the hexagon in its lower part, adding two right triangles to the right, such that the major leg of the two is on the same vertical line. The planar figures whose areas are to be calculated are obtained by placing the right base rectangle triangles on the plate. The dimensions in their legs are 15 and 16 units. Complete the material a sheet in which there are traced cartesian axes and on them drawn an equilateral triangle side 30 units with the base, on the horizontal axis and a vertex at the origin. There are also three squares drawn with two of their sides on the axes and a vertex at the origin. (Machine-translation by Google Translate, not legally binding)