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notice to students of 1 ^ E

The play scheduled for the 31/03/09 will be held starting at 11:00 am and return at 13.00. Thus the first three hours of lessons will be carried out regularly. Do not forget to bring books on arithmetic and science at school.

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"Eratosthenes of Cyrene" the scientist of the sieve ..... and more!

philosopher, mathematician, astronomer, geographer, and more ..... but famous for its sieve and the Earth's radius calculation, calculation exceptional if not for the stunning accuracy close to that obtained by calculations moderni.Se want to know more about the sieve that is on the search for prime numbers Click on this link: http://www.smebreganzona.ti.ch/intranet/Online/crivello/main.php perform online searches for prime numbers less than 400 Delete Section placing multiples of the first 2 and then subsequently the other prime numbers as 3, 5, 7, 11, 13, 17 and 19. You'll see that as you enter these numbers, dialed numbers will disappear and only the actual primes.
Good job!

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What is Tangram?

Tangram consists of seven pieces: a square, a parallelogram, two large equal triangles, a medium triangle and two small triangles.

Among the pieces of the Tangram there are a large number of geometric relationships.

Relationship between areas:

• the large triangle has an area that is twice that of the medium triangle;



• the medium triangle, square and parallelogram have same area;



• the triangle average area that is twice that of the small triangle.

angle measurements:

• the square, obviously, has the four angles of 90 °;



• the parallelogram has two angles of 45 ° and two of 135 °



• five are isosceles triangles and rectangles, for which each have a 90 degree angle and two 45 °.

Relations between the sides:

• the catheter of the large triangle has the same average length of the hypotenuse of the triangle;



• the catheter of the triangle has the same average length of the hypotenuse of the triangle is small, the diagonal of the square and one side of the parallelogram;



• the catheter of the small triangle has the same length of the side and square ' other side of the parallelogram.

These reports, among the side lengths and angle measurements, are those that make possible the construction of the various ways in many combinations.

Link useful for the construction of Tangram:

http://mathforum.org/trscavo/tangrams/construct.html