Angle bisector (= bisectriz)

An angle bisector (=bisectriz) is a line that splits an angle in two equal parts.

If you want to review the concept of angle bisector (bisectriz) have a look at mathisfun

And to review how to draw the angle bisector of a given angle, have a look at the animation they have at mathopenref.com   

-:-:-:-:-:-:-:- -:-:-:-:-:-:-:- 

Una bisectriz (=angle bisector) es una línea que divide un ángulo en dos partes iguales

Puedes revisar lo que quiere decir esta definición en mathisfun

Para aprender a dibujar la bisectriz de un ángulo, mira la animación que tienen en mathopenref.com

 

Perpendicular Bisector = Mediatriz

A PERPENDICULAR BISECTOR (=mediatriz) is a perpendicular line that divides a segment in two equal parts. 

Una MEDIATRIZ (=perpendicular bisector) es una línea perpendicular que divide un segmento en dos partes iguales.

And to review how to draw the perpendicular bisector of a given segment, have a look at the animation they have at mathopenref.com

Polygons given the side

Regular Pentagon


Regular Heptagon



Regular Octagon



Regular polygon of any number of sides, given the side.

In class we did something similar, we only divided in 6 equal parts the upper radius of the circle instead of dividing in 12 equal parts the diametre. As you can see the result is the same.

Victor Vasarely

Hemos estado investigando acerca del trabajo de los artistas de Op-Art. Para completar vuestra investigación os dejo aquí un estupendo material del Städel Museum de Frankfurt que explica su obra con todo detalle.

¡Espero que os guste!

Regular pentagon inscribed in a circle

Have a look at the geometry construction of a regular pentagon inscribed in a circle using a compass and a straightedge.
(clic on the image to see the explanation step by step)

Polygons given the side

Here you can find how to draw the polygons given the side that we have been drawing in class

(don't forget that we are only seeing the pentagon, the heptagon and the octagon)

dibujotecnico.com

Flexagon/flexágono

As I promised, here are the instructions of how to fold a paper flexagon. Enjoy!

Aquí os dejo las instrucciones para hacer el flexágono, están en inglés pero seguro que las entendéis. ¡Disfrutadlo!

As if we were Frank Stella

The 1º E.S.O students created a 3D paper work after the work of Frank Stella. You can have a look at their sculptures:


1ºA

1ºB

1ºC

1ºD

1ºE


They all worked really well. Congratulations!

Polígonos estrellados/Star polygons

As an application for the star polygons, we are going to make christmas stars.
Look here how to make them

Don't forget to bring the wool!!!

I saw the project here: Plástica en el Valle

Quadrilaterals

In math.com you can see a classification of polygons



And HERE you can take a test to practice with their properties

Frank Stella

.
You can still have a look at his work here: Frank Stella