# How to denote medians and bisectors in the drawing?

Robert Turkmenov shared this question 2 years ago

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You've got tools and commands, so can you explain your problem? You only have to look which version (not) tu use: look at https://www.geogebra.org/m/shfwqcpr

1

The situation is as follows. When, for example, I draw the median of a triangle, only the point is indicated, but it is not indicated that these segments are equal. It is the same with the bisector, the geogebra does not denote the equality of angles with arcs.Still have a problem, how to automatically specify the point of contact of two or more circles?

1

To make it look like in the picture

Files: T.pdf
1

How do I get the touch points of circles automatically?Or is it impossible?

Files: C.pdf
1

I think: what you are looking for, GGB does this not do automatically.

(but is a nice idea)

1

And how to do it not automatically?

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one of the possibilities for T.pdf (approximation)

https://www.geogebra.org/m/zghswh77

1

Indeed it's nice when focussing on the properties of these lines. But would I want them to appear in any case when drawing them as auxilliary objects in whatever construction? Maybe not.

Anyway you can create custom tools whit those extra's you want to appear for specific lines.

1

Tell me, please, what kind of tools?

1

See the tutorial: https://www.geogebra.org/m/...

You can select the starting objects and the end objects so to show all what you need if the existing tools don't exactly bring you what you want and make a new tool for it.

1

For example, I want to put serifs on the segments that are divided by the median. It turns out that I need:

1) Put the intersection point of the median and the side

2) From this point, draw segments with the ends of the original segment

3) Go to the style and put serifs.

Couldn't it be easier?

1

1) use the Angle tool

2) change the Decoration of the angles

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I tried it, but it didn't work

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Please post your .ggb file and explain which bit didn't work

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Here is an example. In order to indicate equal angles in the figure when bisecting, I need to: 1) Mark the bisector, 2) Mark each of the half corners; 3) So that the corners do not merge, you need to go to "Styles" and increase the size. Couldn't it be easier?

1

un exemple d'outil

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Je ne comprends pas le sens de l'applet qui a été envoyé?

1

select in menu, then 3 clicks in graphics view

1

attention à sélectionner les points dans le sens antihoraire, c'est plus clair pour voir les égalités d'angles

1

I am not sure but maybe robert is fooling us

Or maybe he seems to know about the complexity of the question and is just not sure if it really can't be done with GGB.

My answer is no, it is not possible in the sense of the questioner. Maybe in 10-20 years with Artificial Intelligence as support for the dumbed down humanity :wink:

But surely with custom-tools for some cases a (semi-automatic) solution can be given. But I doubt that the effort to understand and handle these tools is worth it.

1

si lo que quiere es que cuando él dibuja una bisectriz automáticamente se marquen los ángulos con la misma decoración sería posible con javascript escuchando todos los objetos que se van creando, creando los nuevos necesarios y seleccionando la decoración oportuna, pero si hacemos 20 bisectrices ¿de dónde sacamos 20 decoraciones?

y si la bisectriz no es creada con la herramienta sino por un proceso de dibujo ¿cómo sabe el sistema que hemos hecho una bisectriz?

creo que es una pretensión excesiva para el uso que se puede dar de dicho automatismo y que el pequeño trabajo de marcar los angulos usando la ventana de propiedades hace que no merezca la pena el dedicarle tiempo

también aprovecho, y por eso quería escribir, para aconsejar que se seleccionen todos los angulos que se quieran marcar y se haga una sola vez el trabajo para todos los angulos ( 8 en el caso de pares de paralelas) y así en dos tandas estará resuelto lo que se pretende

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