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TRIANGLES AND QUADRILATERALS

These links introduce you to triangles and quadrilaterals.

https://www.mathsisfun.com/geometry/polygons.html

https://www.mathsisfun.com/triangle.html

https://www.mathsisfun.com/quadrilaterals.html

 

If you need more information, but this time in Spanish, click on this link:

Dibujo Técnico