Question

Cuantos triangulos tienes un decagono?

Answer 1

In a decagon, by joining one vertex to the remaining vertices you can have 8 triangles. If you are considering all the vertices independently you will have a total of 8*10 = 80 triangles.

You can figure out this way: the sum of the interior angles of a decagon = (2n-4)*right angles or (n-2)*triangles. So a decagon will form 8 triangles.

Explanation:

Answer 2

8

Explanation:

Al trazar las diagonales, ¿en cuántos triángulos queda dividido cada polígono? El pentágono, en 3 triángulos. El heptágono en 5 y el decágono, en 8.