TRANSFORMATION OF A POLYGON
STEP 1
It is possible to transform any convex polygon with n sides into a polygon with n-1 sides that has the same area.
Try the proof by yorself following the steps as described below:
1) Draw a polygon with five sides
2) Label its vertexes A, B, C, D, E, F, G anticlockwise
3) Draw , for instance, the diagonal AC and the parallel line r through B to AC
4) Label with F the intersection between r and the extension of CD
5) Prove that the triangle ABC is equivalent to AFC using the tool Area 
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Now the 5-sides polygon as been transformed in a 4-sides polygon of equivalent area.
6) Following the same steps as previous described, try to transform the 4-sides polygon into a triangle.
7) Finally, prove, using the tool area, that the triangle has the same area of the 5-sides polygon.
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Now the 5-sides polygon as been transformed in a 4-sides polygon of equivalent area.
6) Following the same steps as previous described, try to transform the 4-sides polygon into a triangle.
7) Finally, prove, using the tool area, that the triangle has the same area of the 5-sides polygon.
8) Explaine the geometrical reasons of point 5.
6) Following the same steps as previous described, try to transform the 4-sides polygon into a triangle,
such that you can proof that any poligon can be transformed in a triangle.
7) Finally, prove, using the tool area, that the triangle has the same area of the 5-sides polygon.