Respuesta :
The triangles are to place where you want to indent the paragraph, otherwise you move it to put as much space as you want from the left side of the page.
Answer:
Above the page is a ruler with 3 triangles .
Explanation:
The triangle on the upper-left controls the first line indentation .
The triangle on the lower-left controls the indentation respect to the left margin (excluding the first line) .
The triangle on the right controls the indentation respect to the right margin.
