Archivos para la categoría: VA1

The science of symmetry

4 octubre, 2017 //

Geometria relacionada con la naturaleza 5:09

Más centrado en geometría

Reflection Symmetry 5:56

Reflection and rotational Symmetry 6:00

Con el ordenador:

Learn a bit more about symmetry and make a quiz

Etiquetas symmetry, technical drawing

Categorías VA, VA1, VA2, VA4

Visual Arts basic vocabulary

3 septiembre, 2016 //

Basic vocabulary, material

materiales

Material that you need in this class:

Graphite pencils 2B or softer, 2H or harder, HB (regular pencil)
Compass (check if it does work well enough)
Set of rulers (regular militred ruler + triangle square set+protactor)
coloured pencils
felt tip pens
Soft wax crayons
rubber
Scissors
Stick of glue
tape
Pencil sharpener with deposit
folder (4 rings)
paper (4 holes)
craft paper
Brush
watercolors
tempera paints
BOX, that contain all your material

Don’t forget to write your name, level and class in your box and in all your material.

Now check for more materials vocabulary:

Leer el resto de esta entrada »

Etiquetas material, vocabulary

Categorías VA, VA1, VA2, VA4

Polygons

16 May, 2016 //

POLYGONS KNOWN THE LENGTH OF THE SIDE

SQUARE

REGULAR HEXAGON

REGULAR PENTAGON

REGULAR OCTAGON

POLYGONS INSCRIBED IN CIRCLES

This movie shows all the regular polygons that can be exactly drawn using the instruments of classical geometry: ruler and compass. They are the polygons of 3, 4 and 5 sides, as well as their doubles (6, 8, 10), quadruple (12, 16, 20) and so on.

Here you have the polygons that you have to draw

0:16 equilateral triangle inscribed inside a circle
0:26 square inscribed inside a circle
0:41 pentagon inscribed inside a circle
0:57 hexagon inscribed inside a circle
1:07 octagon inscribed inside a circle (starting from a square)
1:10 decagon inscribed inside a circle

SQUARE INSCRIBED INSIDE A CIRCLE

REGULAR PENTAGON INSCRIBED INSIDE A CIRCLE

OCTAGON INSCRIBED INSIDE A CIRCLE

GENERAL METHOD TO DRAW REGULAR POLYGONS INSCRIBED INSIDE A CIRCLE

Voluntary

And now a few music videos to help you remember all this vocabulary

Etiquetas geometry, technical drawing

Categorías VA, VA1, VA2, VA4

Colour without getting dirty!

9 May, 2016 //

Here we are going to make a chromatic circle using a flash simulator.

We have to move the cursor of the primary colors. For these chromatic circle we will only need 50% and 10% of color.

Primary colors 100 %

Mixing two primary colors al a time 100% each to obtain secondary colors.

Mixing two primary colors al a time, one of them 100% the other 50%

Etiquetas colour, recursos

Categorías VA, VA1, VA2

Introduction to geometry

25 abril, 2016 //

Angles in the triangle set square. Construction of different angles with the TSQ.

In Spanish,

BISECTION OF A LINE

This video is going to show you how to bisect a line.

*bisection of a line means MEDIATRIZ

*bisection of an angle means BISECTRIZ

To bisect a line we are going to cut it into two pieces that are exactly the same lenz. To beging with we need to match up the compass at the very left hand point of the line.

We put the needle in the last point of the line. Open the compass to more than half way along the line. Lift it up and draw a large arc that goes from the top to the bottom and intersects the line.
Now we move the needle of the compass to the other extreme of the line. While doing this the distance between the needle and the graphite of the compass remains exactly the same.
We lift the compass again and draw a large arc from the top to the bottom. Now you should see that the two arcs are intersected at two different points.
We draw a vertical line that goes from one point in the first intersection to the second intersection.
We have already bisected the line into two halfs. We can check that by getting our ruler and measuring it.
We also notice that the bisection is perpendicular to the line. We can check that with our protractor.

BISECTION OF AN ANGLE

We put the needle in the vertex of the angle we open the compass a little bit, to a confortable length, we draw an arc that intersects both sides of the angle. In the next step you can change the opening of the compass but you don’t necessarily have to, but then for the next two arcs it has to be the exact same length.
We take the needle to one of the intersections that we just made and we draw an arc. It needs to be big enough to cross the center of the arc.
We take the needle to the other intersection and with the same length we draw another arc. It must cross the last arc
Draw a line that goes from the vertex to the intersection of the two arcs.

Bisectriz y mediatriz a mano:

_____

EQUILATERAL TRIANGLE

We start with a segment.

We put the needle of the compass in one extreme of the segment and open it till the graphite reaches the other extreme of the segment. We draw an arc, like a quarter of circle.
We swap around to the other end of the line and draw another arc.
Where these two arcs meet is the third vertex of the triangle.
We join the vertex.

DRAW A 60º ANGLE

We do it by doing half a triangle

DRAW A 30º ANGLE

We draw a 60º angle and the we bisect it.