TECHNICAL DRAWING VS ARTISTIC DRAWING

Radial Symmetry, GeoGebra and Google Drive

Click on the image beside and try to make a similar one yourself. Remember that you can change colour, width and the number of axis as well.

If you wish, it´s better to download the GeoGebra applet and work offline.

This applet works with dynamic random colours. In the video below you can find out how to use it.

POLYGONS

Polygons 100830211438-phpapp01 from rfarinas

OPERATIONS WITH SEGMENTS AND ANGLES

A PLANE can be defined by:

Please, follow the steps below. And here you have the notes. Exercise 1. Line bisector of a segment

Thales´Theorem (measuring the Pyramid)

If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points the other two sides are divided in the same ratio.

According to some historical sources the Greek mathematician Thales applied the intercept theorem to determine the height of the Cheops' pyramid. 

Thales measured the length of the pyramid's base and the height of his pole (a long stick). Then at the same time of the day he measured the length of the pyramid's shadow and the length of the pole's shadow.

Exercise 2. Dividing a segment into a set number of equal parts 

Exercise 3. Angle bisector 

4.Dividing an angle into 3 equal parts

Segment copying construction Copying an angle

LETTERING

Lettering helps to communicate information on drawings. All lettering should be done freehand without the aid of instruments. It must be neat, clear and easy to read. There are many different approaches to lettering, but the one shown below is standard for school use.

The letters and numbers are formed between light construction lines called guidelines, which are drawn 4 or 5 mm apart. Capital letters are usually used, but lower-case letters may be used. Note the following:

• The letters A C D E G H K M O Q R W fill a square space.
• The letters O and Q are based on a circle.
• The remainder (except I) fill about two-thirds of a square.
• Space between words should be equal to the with of one letter, and the distance between letters and numbers must be uniform. Keep the letters in each word close together.

SECOND TERM PROJECTS

This term is quite short. We´ve only got two weeks left.
Make sure you bring me all of the Projects (Arts and Technical Graphics) on the picture below before the deadline (during the first week of  March).

USING THE SET SQUARES: TRIANGLES AND PARALLELS